diff --git a/tests/draft-future/optional/format/date-time.json b/tests/draft-future/optional/format/date-time.json
index 5f911efe..119179ca 100644
--- a/tests/draft-future/optional/format/date-time.json
+++ b/tests/draft-future/optional/format/date-time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date-time string",
                 "data": "1963-06-19T08:30:06.283185Z",
@@ -33,6 +63,11 @@
                 "data": "1990-12-31T15:59:60-24:00",
                 "valid": false
             },
+            {
+                "description": "an invalid closing Z after time-zone offset",
+                "data": "1963-06-19T08:30:06.28123+01:00Z",
+                "valid": false
+            },
             {
                 "description": "an invalid date-time string",
                 "data": "06/19/1963 08:30:06 PST",
diff --git a/tests/draft-future/optional/format/date.json b/tests/draft-future/optional/format/date.json
index 6cc2feb8..b4f61eed 100644
--- a/tests/draft-future/optional/format/date.json
+++ b/tests/draft-future/optional/format/date.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date strings",
-        "schema": {"format": "date"},
+        "schema": { "format": "date" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date string",
                 "data": "1963-06-19",
diff --git a/tests/draft-future/optional/format/duration.json b/tests/draft-future/optional/format/duration.json
index eb33dbbf..741348ae 100644
--- a/tests/draft-future/optional/format/duration.json
+++ b/tests/draft-future/optional/format/duration.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of duration strings",
-        "schema": {"format": "duration"},
+        "schema": { "format": "duration" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid duration string",
                 "data": "P4DT12H30M5S",
diff --git a/tests/draft-future/optional/format/email.json b/tests/draft-future/optional/format/email.json
index 02396d26..d6761a46 100644
--- a/tests/draft-future/optional/format/email.json
+++ b/tests/draft-future/optional/format/email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid e-mail address",
                 "data": "joe.bloggs@example.com",
diff --git a/tests/draft-future/optional/format/hostname.json b/tests/draft-future/optional/format/hostname.json
index 476541a8..8a67fda8 100644
--- a/tests/draft-future/optional/format/hostname.json
+++ b/tests/draft-future/optional/format/hostname.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "hostname"},
+        "schema": { "format": "hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name",
                 "data": "www.example.com",
diff --git a/tests/draft-future/optional/format/idn-email.json b/tests/draft-future/optional/format/idn-email.json
index 552d1067..6e213745 100644
--- a/tests/draft-future/optional/format/idn-email.json
+++ b/tests/draft-future/optional/format/idn-email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of an internationalized e-mail addresses",
-        "schema": {"format": "idn-email"},
+        "schema": { "format": "idn-email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid idn e-mail (example@example.test in Hangul)",
                 "data": "실례@실례.테스트",
diff --git a/tests/draft-future/optional/format/idn-hostname.json b/tests/draft-future/optional/format/idn-hostname.json
index bbb257b9..6c8f86a3 100644
--- a/tests/draft-future/optional/format/idn-hostname.json
+++ b/tests/draft-future/optional/format/idn-hostname.json
@@ -3,6 +3,36 @@
         "description": "validation of internationalized host names",
         "schema": { "format": "idn-hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name (example.test in Hangul)",
                 "data": "실례.테스트",
diff --git a/tests/draft-future/optional/format/ipv4.json b/tests/draft-future/optional/format/ipv4.json
index 4d109277..6b166c70 100644
--- a/tests/draft-future/optional/format/ipv4.json
+++ b/tests/draft-future/optional/format/ipv4.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ipv4"},
+        "schema": { "format": "ipv4" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IP address",
                 "data": "192.168.0.1",
diff --git a/tests/draft-future/optional/format/ipv6.json b/tests/draft-future/optional/format/ipv6.json
index cf629c60..caad69b1 100644
--- a/tests/draft-future/optional/format/ipv6.json
+++ b/tests/draft-future/optional/format/ipv6.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IPv6 address",
                 "data": "::1",
diff --git a/tests/draft-future/optional/format/iri-reference.json b/tests/draft-future/optional/format/iri-reference.json
index 1fd779c2..c6b4c22a 100644
--- a/tests/draft-future/optional/format/iri-reference.json
+++ b/tests/draft-future/optional/format/iri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRI References",
-        "schema": {"format": "iri-reference"},
+        "schema": { "format": "iri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft-future/optional/format/iri.json b/tests/draft-future/optional/format/iri.json
index 1414f2e6..a0d12aed 100644
--- a/tests/draft-future/optional/format/iri.json
+++ b/tests/draft-future/optional/format/iri.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRIs",
-        "schema": {"format": "iri"},
+        "schema": { "format": "iri" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI with anchor tag",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft-future/optional/format/json-pointer.json b/tests/draft-future/optional/format/json-pointer.json
index 65c2f064..a0346b57 100644
--- a/tests/draft-future/optional/format/json-pointer.json
+++ b/tests/draft-future/optional/format/json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of JSON-pointers (JSON String Representation)",
-        "schema": {"format": "json-pointer"},
+        "schema": { "format": "json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid JSON-pointer",
                 "data": "/foo/bar~0/baz~1/%a",
diff --git a/tests/draft-future/optional/format/regex.json b/tests/draft-future/optional/format/regex.json
index d99d021e..34491770 100644
--- a/tests/draft-future/optional/format/regex.json
+++ b/tests/draft-future/optional/format/regex.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of regular expressions",
-        "schema": {"format": "regex"},
+        "schema": { "format": "regex" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid regular expression",
                 "data": "([abc])+\\s+$",
diff --git a/tests/draft-future/optional/format/relative-json-pointer.json b/tests/draft-future/optional/format/relative-json-pointer.json
index 22fb14e0..9309986f 100644
--- a/tests/draft-future/optional/format/relative-json-pointer.json
+++ b/tests/draft-future/optional/format/relative-json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of Relative JSON Pointers (RJP)",
-        "schema": {"format": "relative-json-pointer"},
+        "schema": { "format": "relative-json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid upwards RJP",
                 "data": "1",
diff --git a/tests/draft-future/optional/format/time.json b/tests/draft-future/optional/format/time.json
index 0a8da0e9..5011d788 100644
--- a/tests/draft-future/optional/format/time.json
+++ b/tests/draft-future/optional/format/time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of time strings",
-        "schema": {"format": "time"},
+        "schema": { "format": "time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid time string",
                 "data": "08:30:06Z",
diff --git a/tests/draft-future/optional/format/uri-reference.json b/tests/draft-future/optional/format/uri-reference.json
index e4c9eef6..7cdf228d 100644
--- a/tests/draft-future/optional/format/uri-reference.json
+++ b/tests/draft-future/optional/format/uri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of URI References",
-        "schema": {"format": "uri-reference"},
+        "schema": { "format": "uri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid URI",
                 "data": "http://foo.bar/?baz=qux#quux",
diff --git a/tests/draft-future/optional/format/uri-template.json b/tests/draft-future/optional/format/uri-template.json
index 33ab76ee..df355c55 100644
--- a/tests/draft-future/optional/format/uri-template.json
+++ b/tests/draft-future/optional/format/uri-template.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "format: uri-template",
-        "schema": {"format": "uri-template"},
+        "schema": { "format": "uri-template" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid uri-template",
                 "data": "http://example.com/dictionary/{term:1}/{term}",
diff --git a/tests/draft-future/optional/format/uri.json b/tests/draft-future/optional/format/uri.json
index 58d30857..792d71a0 100644
--- a/tests/draft-future/optional/format/uri.json
+++ b/tests/draft-future/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URL with anchor tag",
diff --git a/tests/draft2019-09/optional/format/date-time.json b/tests/draft2019-09/optional/format/date-time.json
index 5f911efe..119179ca 100644
--- a/tests/draft2019-09/optional/format/date-time.json
+++ b/tests/draft2019-09/optional/format/date-time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date-time string",
                 "data": "1963-06-19T08:30:06.283185Z",
@@ -33,6 +63,11 @@
                 "data": "1990-12-31T15:59:60-24:00",
                 "valid": false
             },
+            {
+                "description": "an invalid closing Z after time-zone offset",
+                "data": "1963-06-19T08:30:06.28123+01:00Z",
+                "valid": false
+            },
             {
                 "description": "an invalid date-time string",
                 "data": "06/19/1963 08:30:06 PST",
diff --git a/tests/draft2019-09/optional/format/date.json b/tests/draft2019-09/optional/format/date.json
index 6cc2feb8..b4f61eed 100644
--- a/tests/draft2019-09/optional/format/date.json
+++ b/tests/draft2019-09/optional/format/date.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date strings",
-        "schema": {"format": "date"},
+        "schema": { "format": "date" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date string",
                 "data": "1963-06-19",
diff --git a/tests/draft2019-09/optional/format/duration.json b/tests/draft2019-09/optional/format/duration.json
index eb33dbbf..741348ae 100644
--- a/tests/draft2019-09/optional/format/duration.json
+++ b/tests/draft2019-09/optional/format/duration.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of duration strings",
-        "schema": {"format": "duration"},
+        "schema": { "format": "duration" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid duration string",
                 "data": "P4DT12H30M5S",
diff --git a/tests/draft2019-09/optional/format/email.json b/tests/draft2019-09/optional/format/email.json
index 02396d26..d6761a46 100644
--- a/tests/draft2019-09/optional/format/email.json
+++ b/tests/draft2019-09/optional/format/email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid e-mail address",
                 "data": "joe.bloggs@example.com",
diff --git a/tests/draft2019-09/optional/format/hostname.json b/tests/draft2019-09/optional/format/hostname.json
index 476541a8..8a67fda8 100644
--- a/tests/draft2019-09/optional/format/hostname.json
+++ b/tests/draft2019-09/optional/format/hostname.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "hostname"},
+        "schema": { "format": "hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name",
                 "data": "www.example.com",
diff --git a/tests/draft2019-09/optional/format/idn-email.json b/tests/draft2019-09/optional/format/idn-email.json
index 552d1067..6e213745 100644
--- a/tests/draft2019-09/optional/format/idn-email.json
+++ b/tests/draft2019-09/optional/format/idn-email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of an internationalized e-mail addresses",
-        "schema": {"format": "idn-email"},
+        "schema": { "format": "idn-email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid idn e-mail (example@example.test in Hangul)",
                 "data": "실례@실례.테스트",
diff --git a/tests/draft2019-09/optional/format/idn-hostname.json b/tests/draft2019-09/optional/format/idn-hostname.json
index bbb257b9..6c8f86a3 100644
--- a/tests/draft2019-09/optional/format/idn-hostname.json
+++ b/tests/draft2019-09/optional/format/idn-hostname.json
@@ -3,6 +3,36 @@
         "description": "validation of internationalized host names",
         "schema": { "format": "idn-hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name (example.test in Hangul)",
                 "data": "실례.테스트",
diff --git a/tests/draft2019-09/optional/format/ipv4.json b/tests/draft2019-09/optional/format/ipv4.json
index 4d109277..6b166c70 100644
--- a/tests/draft2019-09/optional/format/ipv4.json
+++ b/tests/draft2019-09/optional/format/ipv4.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ipv4"},
+        "schema": { "format": "ipv4" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IP address",
                 "data": "192.168.0.1",
diff --git a/tests/draft2019-09/optional/format/ipv6.json b/tests/draft2019-09/optional/format/ipv6.json
index cf629c60..caad69b1 100644
--- a/tests/draft2019-09/optional/format/ipv6.json
+++ b/tests/draft2019-09/optional/format/ipv6.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IPv6 address",
                 "data": "::1",
diff --git a/tests/draft2019-09/optional/format/iri-reference.json b/tests/draft2019-09/optional/format/iri-reference.json
index 1fd779c2..c6b4c22a 100644
--- a/tests/draft2019-09/optional/format/iri-reference.json
+++ b/tests/draft2019-09/optional/format/iri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRI References",
-        "schema": {"format": "iri-reference"},
+        "schema": { "format": "iri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft2019-09/optional/format/iri.json b/tests/draft2019-09/optional/format/iri.json
index 1414f2e6..a0d12aed 100644
--- a/tests/draft2019-09/optional/format/iri.json
+++ b/tests/draft2019-09/optional/format/iri.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRIs",
-        "schema": {"format": "iri"},
+        "schema": { "format": "iri" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI with anchor tag",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft2019-09/optional/format/json-pointer.json b/tests/draft2019-09/optional/format/json-pointer.json
index 65c2f064..a0346b57 100644
--- a/tests/draft2019-09/optional/format/json-pointer.json
+++ b/tests/draft2019-09/optional/format/json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of JSON-pointers (JSON String Representation)",
-        "schema": {"format": "json-pointer"},
+        "schema": { "format": "json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid JSON-pointer",
                 "data": "/foo/bar~0/baz~1/%a",
diff --git a/tests/draft2019-09/optional/format/regex.json b/tests/draft2019-09/optional/format/regex.json
index d99d021e..34491770 100644
--- a/tests/draft2019-09/optional/format/regex.json
+++ b/tests/draft2019-09/optional/format/regex.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of regular expressions",
-        "schema": {"format": "regex"},
+        "schema": { "format": "regex" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid regular expression",
                 "data": "([abc])+\\s+$",
diff --git a/tests/draft2019-09/optional/format/relative-json-pointer.json b/tests/draft2019-09/optional/format/relative-json-pointer.json
index 22fb14e0..9309986f 100644
--- a/tests/draft2019-09/optional/format/relative-json-pointer.json
+++ b/tests/draft2019-09/optional/format/relative-json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of Relative JSON Pointers (RJP)",
-        "schema": {"format": "relative-json-pointer"},
+        "schema": { "format": "relative-json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid upwards RJP",
                 "data": "1",
diff --git a/tests/draft2019-09/optional/format/time.json b/tests/draft2019-09/optional/format/time.json
index 0a8da0e9..5011d788 100644
--- a/tests/draft2019-09/optional/format/time.json
+++ b/tests/draft2019-09/optional/format/time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of time strings",
-        "schema": {"format": "time"},
+        "schema": { "format": "time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid time string",
                 "data": "08:30:06Z",
diff --git a/tests/draft2019-09/optional/format/uri-reference.json b/tests/draft2019-09/optional/format/uri-reference.json
index e4c9eef6..7cdf228d 100644
--- a/tests/draft2019-09/optional/format/uri-reference.json
+++ b/tests/draft2019-09/optional/format/uri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of URI References",
-        "schema": {"format": "uri-reference"},
+        "schema": { "format": "uri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid URI",
                 "data": "http://foo.bar/?baz=qux#quux",
diff --git a/tests/draft2019-09/optional/format/uri-template.json b/tests/draft2019-09/optional/format/uri-template.json
index 33ab76ee..df355c55 100644
--- a/tests/draft2019-09/optional/format/uri-template.json
+++ b/tests/draft2019-09/optional/format/uri-template.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "format: uri-template",
-        "schema": {"format": "uri-template"},
+        "schema": { "format": "uri-template" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid uri-template",
                 "data": "http://example.com/dictionary/{term:1}/{term}",
diff --git a/tests/draft2019-09/optional/format/uri.json b/tests/draft2019-09/optional/format/uri.json
index 58d30857..792d71a0 100644
--- a/tests/draft2019-09/optional/format/uri.json
+++ b/tests/draft2019-09/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URL with anchor tag",
diff --git a/tests/draft2020-12/optional/format/date-time.json b/tests/draft2020-12/optional/format/date-time.json
index 5f911efe..119179ca 100644
--- a/tests/draft2020-12/optional/format/date-time.json
+++ b/tests/draft2020-12/optional/format/date-time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date-time string",
                 "data": "1963-06-19T08:30:06.283185Z",
@@ -33,6 +63,11 @@
                 "data": "1990-12-31T15:59:60-24:00",
                 "valid": false
             },
+            {
+                "description": "an invalid closing Z after time-zone offset",
+                "data": "1963-06-19T08:30:06.28123+01:00Z",
+                "valid": false
+            },
             {
                 "description": "an invalid date-time string",
                 "data": "06/19/1963 08:30:06 PST",
diff --git a/tests/draft2020-12/optional/format/date.json b/tests/draft2020-12/optional/format/date.json
index 6cc2feb8..b4f61eed 100644
--- a/tests/draft2020-12/optional/format/date.json
+++ b/tests/draft2020-12/optional/format/date.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date strings",
-        "schema": {"format": "date"},
+        "schema": { "format": "date" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date string",
                 "data": "1963-06-19",
diff --git a/tests/draft2020-12/optional/format/duration.json b/tests/draft2020-12/optional/format/duration.json
index eb33dbbf..741348ae 100644
--- a/tests/draft2020-12/optional/format/duration.json
+++ b/tests/draft2020-12/optional/format/duration.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of duration strings",
-        "schema": {"format": "duration"},
+        "schema": { "format": "duration" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid duration string",
                 "data": "P4DT12H30M5S",
diff --git a/tests/draft2020-12/optional/format/email.json b/tests/draft2020-12/optional/format/email.json
index 02396d26..d6761a46 100644
--- a/tests/draft2020-12/optional/format/email.json
+++ b/tests/draft2020-12/optional/format/email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid e-mail address",
                 "data": "joe.bloggs@example.com",
diff --git a/tests/draft2020-12/optional/format/hostname.json b/tests/draft2020-12/optional/format/hostname.json
index 476541a8..8a67fda8 100644
--- a/tests/draft2020-12/optional/format/hostname.json
+++ b/tests/draft2020-12/optional/format/hostname.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "hostname"},
+        "schema": { "format": "hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name",
                 "data": "www.example.com",
diff --git a/tests/draft2020-12/optional/format/idn-email.json b/tests/draft2020-12/optional/format/idn-email.json
index 552d1067..6e213745 100644
--- a/tests/draft2020-12/optional/format/idn-email.json
+++ b/tests/draft2020-12/optional/format/idn-email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of an internationalized e-mail addresses",
-        "schema": {"format": "idn-email"},
+        "schema": { "format": "idn-email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid idn e-mail (example@example.test in Hangul)",
                 "data": "실례@실례.테스트",
diff --git a/tests/draft2020-12/optional/format/idn-hostname.json b/tests/draft2020-12/optional/format/idn-hostname.json
index bbb257b9..6c8f86a3 100644
--- a/tests/draft2020-12/optional/format/idn-hostname.json
+++ b/tests/draft2020-12/optional/format/idn-hostname.json
@@ -3,6 +3,36 @@
         "description": "validation of internationalized host names",
         "schema": { "format": "idn-hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name (example.test in Hangul)",
                 "data": "실례.테스트",
diff --git a/tests/draft2020-12/optional/format/ipv4.json b/tests/draft2020-12/optional/format/ipv4.json
index 4d109277..6b166c70 100644
--- a/tests/draft2020-12/optional/format/ipv4.json
+++ b/tests/draft2020-12/optional/format/ipv4.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ipv4"},
+        "schema": { "format": "ipv4" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IP address",
                 "data": "192.168.0.1",
diff --git a/tests/draft2020-12/optional/format/ipv6.json b/tests/draft2020-12/optional/format/ipv6.json
index cf629c60..caad69b1 100644
--- a/tests/draft2020-12/optional/format/ipv6.json
+++ b/tests/draft2020-12/optional/format/ipv6.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IPv6 address",
                 "data": "::1",
diff --git a/tests/draft2020-12/optional/format/iri-reference.json b/tests/draft2020-12/optional/format/iri-reference.json
index 1fd779c2..c6b4c22a 100644
--- a/tests/draft2020-12/optional/format/iri-reference.json
+++ b/tests/draft2020-12/optional/format/iri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRI References",
-        "schema": {"format": "iri-reference"},
+        "schema": { "format": "iri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft2020-12/optional/format/iri.json b/tests/draft2020-12/optional/format/iri.json
index 1414f2e6..a0d12aed 100644
--- a/tests/draft2020-12/optional/format/iri.json
+++ b/tests/draft2020-12/optional/format/iri.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRIs",
-        "schema": {"format": "iri"},
+        "schema": { "format": "iri" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI with anchor tag",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft2020-12/optional/format/json-pointer.json b/tests/draft2020-12/optional/format/json-pointer.json
index 65c2f064..a0346b57 100644
--- a/tests/draft2020-12/optional/format/json-pointer.json
+++ b/tests/draft2020-12/optional/format/json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of JSON-pointers (JSON String Representation)",
-        "schema": {"format": "json-pointer"},
+        "schema": { "format": "json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid JSON-pointer",
                 "data": "/foo/bar~0/baz~1/%a",
diff --git a/tests/draft2020-12/optional/format/regex.json b/tests/draft2020-12/optional/format/regex.json
index d99d021e..34491770 100644
--- a/tests/draft2020-12/optional/format/regex.json
+++ b/tests/draft2020-12/optional/format/regex.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of regular expressions",
-        "schema": {"format": "regex"},
+        "schema": { "format": "regex" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid regular expression",
                 "data": "([abc])+\\s+$",
diff --git a/tests/draft2020-12/optional/format/relative-json-pointer.json b/tests/draft2020-12/optional/format/relative-json-pointer.json
index 22fb14e0..9309986f 100644
--- a/tests/draft2020-12/optional/format/relative-json-pointer.json
+++ b/tests/draft2020-12/optional/format/relative-json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of Relative JSON Pointers (RJP)",
-        "schema": {"format": "relative-json-pointer"},
+        "schema": { "format": "relative-json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid upwards RJP",
                 "data": "1",
diff --git a/tests/draft2020-12/optional/format/time.json b/tests/draft2020-12/optional/format/time.json
index 0a8da0e9..5011d788 100644
--- a/tests/draft2020-12/optional/format/time.json
+++ b/tests/draft2020-12/optional/format/time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of time strings",
-        "schema": {"format": "time"},
+        "schema": { "format": "time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid time string",
                 "data": "08:30:06Z",
diff --git a/tests/draft2020-12/optional/format/uri-reference.json b/tests/draft2020-12/optional/format/uri-reference.json
index e4c9eef6..7cdf228d 100644
--- a/tests/draft2020-12/optional/format/uri-reference.json
+++ b/tests/draft2020-12/optional/format/uri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of URI References",
-        "schema": {"format": "uri-reference"},
+        "schema": { "format": "uri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid URI",
                 "data": "http://foo.bar/?baz=qux#quux",
diff --git a/tests/draft2020-12/optional/format/uri-template.json b/tests/draft2020-12/optional/format/uri-template.json
index 33ab76ee..df355c55 100644
--- a/tests/draft2020-12/optional/format/uri-template.json
+++ b/tests/draft2020-12/optional/format/uri-template.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "format: uri-template",
-        "schema": {"format": "uri-template"},
+        "schema": { "format": "uri-template" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid uri-template",
                 "data": "http://example.com/dictionary/{term:1}/{term}",
diff --git a/tests/draft2020-12/optional/format/uri.json b/tests/draft2020-12/optional/format/uri.json
index 58d30857..792d71a0 100644
--- a/tests/draft2020-12/optional/format/uri.json
+++ b/tests/draft2020-12/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URL with anchor tag",
diff --git a/tests/draft3/optional/format/color.json b/tests/draft3/optional/format/color.json
index e80cb69e..0c0b5348 100644
--- a/tests/draft3/optional/format/color.json
+++ b/tests/draft3/optional/format/color.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of CSS colors",
-        "schema": {"format": "color"},
+        "schema": { "format": "color" },
         "tests": [
             {
                 "description": "a valid CSS color name",
diff --git a/tests/draft3/optional/format/date-time.json b/tests/draft3/optional/format/date-time.json
index 58261fad..1f1e6fb3 100644
--- a/tests/draft3/optional/format/date-time.json
+++ b/tests/draft3/optional/format/date-time.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
             {
                 "description": "a valid date-time string",
diff --git a/tests/draft3/optional/format/date.json b/tests/draft3/optional/format/date.json
index 554fe548..796bc463 100644
--- a/tests/draft3/optional/format/date.json
+++ b/tests/draft3/optional/format/date.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of date strings",
-        "schema": {"format": "date"},
+        "schema": { "format": "date" },
         "tests": [
             {
                 "description": "a valid date string",
diff --git a/tests/draft3/optional/format/email.json b/tests/draft3/optional/format/email.json
index 02396d26..059615ad 100644
--- a/tests/draft3/optional/format/email.json
+++ b/tests/draft3/optional/format/email.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
             {
                 "description": "a valid e-mail address",
diff --git a/tests/draft3/optional/format/host-name.json b/tests/draft3/optional/format/host-name.json
index 8f6e28a0..d418f376 100644
--- a/tests/draft3/optional/format/host-name.json
+++ b/tests/draft3/optional/format/host-name.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "host-name"},
+        "schema": { "format": "host-name" },
         "tests": [
             {
                 "description": "a valid host name",
diff --git a/tests/draft3/optional/format/ip-address.json b/tests/draft3/optional/format/ip-address.json
index c868bfb5..91cac9fa 100644
--- a/tests/draft3/optional/format/ip-address.json
+++ b/tests/draft3/optional/format/ip-address.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ip-address"},
+        "schema": { "format": "ip-address" },
         "tests": [
             {
                 "description": "a valid IP address",
diff --git a/tests/draft3/optional/format/ipv6.json b/tests/draft3/optional/format/ipv6.json
index 131edb82..c3ef3790 100644
--- a/tests/draft3/optional/format/ipv6.json
+++ b/tests/draft3/optional/format/ipv6.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
             {
                 "description": "a valid IPv6 address",
diff --git a/tests/draft3/optional/format/regex.json b/tests/draft3/optional/format/regex.json
index d99d021e..8a377638 100644
--- a/tests/draft3/optional/format/regex.json
+++ b/tests/draft3/optional/format/regex.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of regular expressions",
-        "schema": {"format": "regex"},
+        "schema": { "format": "regex" },
         "tests": [
             {
                 "description": "a valid regular expression",
diff --git a/tests/draft3/optional/format/time.json b/tests/draft3/optional/format/time.json
index e97160de..36c823e6 100644
--- a/tests/draft3/optional/format/time.json
+++ b/tests/draft3/optional/format/time.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of time strings",
-        "schema": {"format": "time"},
+        "schema": { "format": "time" },
         "tests": [
             {
                 "description": "a valid time string",
diff --git a/tests/draft3/optional/format/uri.json b/tests/draft3/optional/format/uri.json
index 9c4de354..f024b624 100644
--- a/tests/draft3/optional/format/uri.json
+++ b/tests/draft3/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URI",
diff --git a/tests/draft4/optional/format/date-time.json b/tests/draft4/optional/format/date-time.json
index 5f911efe..119179ca 100644
--- a/tests/draft4/optional/format/date-time.json
+++ b/tests/draft4/optional/format/date-time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date-time string",
                 "data": "1963-06-19T08:30:06.283185Z",
@@ -33,6 +63,11 @@
                 "data": "1990-12-31T15:59:60-24:00",
                 "valid": false
             },
+            {
+                "description": "an invalid closing Z after time-zone offset",
+                "data": "1963-06-19T08:30:06.28123+01:00Z",
+                "valid": false
+            },
             {
                 "description": "an invalid date-time string",
                 "data": "06/19/1963 08:30:06 PST",
diff --git a/tests/draft4/optional/format/email.json b/tests/draft4/optional/format/email.json
index 02396d26..d6761a46 100644
--- a/tests/draft4/optional/format/email.json
+++ b/tests/draft4/optional/format/email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid e-mail address",
                 "data": "joe.bloggs@example.com",
diff --git a/tests/draft4/optional/format/hostname.json b/tests/draft4/optional/format/hostname.json
index e913abad..8a67fda8 100644
--- a/tests/draft4/optional/format/hostname.json
+++ b/tests/draft4/optional/format/hostname.json
@@ -1,13 +1,48 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "hostname"},
+        "schema": { "format": "hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name",
                 "data": "www.example.com",
                 "valid": true
             },
+            {
+                "description": "a valid punycoded IDN hostname",
+                "data": "xn--4gbwdl.xn--wgbh1c",
+                "valid": true
+            },
             {
                 "description": "a host name starting with an illegal character",
                 "data": "-a-host-name-that-starts-with--",
@@ -61,4 +96,3 @@
         ]
     }
 ]
-
diff --git a/tests/draft4/optional/format/ipv4.json b/tests/draft4/optional/format/ipv4.json
index 4d109277..6b166c70 100644
--- a/tests/draft4/optional/format/ipv4.json
+++ b/tests/draft4/optional/format/ipv4.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ipv4"},
+        "schema": { "format": "ipv4" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IP address",
                 "data": "192.168.0.1",
diff --git a/tests/draft4/optional/format/ipv6.json b/tests/draft4/optional/format/ipv6.json
index cf629c60..caad69b1 100644
--- a/tests/draft4/optional/format/ipv6.json
+++ b/tests/draft4/optional/format/ipv6.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IPv6 address",
                 "data": "::1",
diff --git a/tests/draft4/optional/format/uri.json b/tests/draft4/optional/format/uri.json
index 58d30857..792d71a0 100644
--- a/tests/draft4/optional/format/uri.json
+++ b/tests/draft4/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URL with anchor tag",
diff --git a/tests/draft6/optional/format/date-time.json b/tests/draft6/optional/format/date-time.json
index 2dd214ab..119179ca 100644
--- a/tests/draft6/optional/format/date-time.json
+++ b/tests/draft6/optional/format/date-time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date-time string",
                 "data": "1963-06-19T08:30:06.283185Z",
diff --git a/tests/draft6/optional/format/email.json b/tests/draft6/optional/format/email.json
index 02396d26..d6761a46 100644
--- a/tests/draft6/optional/format/email.json
+++ b/tests/draft6/optional/format/email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid e-mail address",
                 "data": "joe.bloggs@example.com",
diff --git a/tests/draft6/optional/format/hostname.json b/tests/draft6/optional/format/hostname.json
index d7654e01..8a67fda8 100644
--- a/tests/draft6/optional/format/hostname.json
+++ b/tests/draft6/optional/format/hostname.json
@@ -1,13 +1,48 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "hostname"},
+        "schema": { "format": "hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name",
                 "data": "www.example.com",
                 "valid": true
             },
+            {
+                "description": "a valid punycoded IDN hostname",
+                "data": "xn--4gbwdl.xn--wgbh1c",
+                "valid": true
+            },
             {
                 "description": "a host name starting with an illegal character",
                 "data": "-a-host-name-that-starts-with--",
diff --git a/tests/draft6/optional/format/ipv4.json b/tests/draft6/optional/format/ipv4.json
index 4d109277..6b166c70 100644
--- a/tests/draft6/optional/format/ipv4.json
+++ b/tests/draft6/optional/format/ipv4.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ipv4"},
+        "schema": { "format": "ipv4" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IP address",
                 "data": "192.168.0.1",
diff --git a/tests/draft6/optional/format/ipv6.json b/tests/draft6/optional/format/ipv6.json
index cf629c60..caad69b1 100644
--- a/tests/draft6/optional/format/ipv6.json
+++ b/tests/draft6/optional/format/ipv6.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IPv6 address",
                 "data": "::1",
diff --git a/tests/draft6/optional/format/json-pointer.json b/tests/draft6/optional/format/json-pointer.json
index 65c2f064..a0346b57 100644
--- a/tests/draft6/optional/format/json-pointer.json
+++ b/tests/draft6/optional/format/json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of JSON-pointers (JSON String Representation)",
-        "schema": {"format": "json-pointer"},
+        "schema": { "format": "json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid JSON-pointer",
                 "data": "/foo/bar~0/baz~1/%a",
diff --git a/tests/draft6/optional/format/uri-reference.json b/tests/draft6/optional/format/uri-reference.json
index e4c9eef6..7cdf228d 100644
--- a/tests/draft6/optional/format/uri-reference.json
+++ b/tests/draft6/optional/format/uri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of URI References",
-        "schema": {"format": "uri-reference"},
+        "schema": { "format": "uri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid URI",
                 "data": "http://foo.bar/?baz=qux#quux",
diff --git a/tests/draft6/optional/format/uri-template.json b/tests/draft6/optional/format/uri-template.json
index 33ab76ee..df355c55 100644
--- a/tests/draft6/optional/format/uri-template.json
+++ b/tests/draft6/optional/format/uri-template.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "format: uri-template",
-        "schema": {"format": "uri-template"},
+        "schema": { "format": "uri-template" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid uri-template",
                 "data": "http://example.com/dictionary/{term:1}/{term}",
diff --git a/tests/draft6/optional/format/uri.json b/tests/draft6/optional/format/uri.json
index 58d30857..792d71a0 100644
--- a/tests/draft6/optional/format/uri.json
+++ b/tests/draft6/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URL with anchor tag",
diff --git a/tests/draft7/optional/format/date-time.json b/tests/draft7/optional/format/date-time.json
index 5f911efe..119179ca 100644
--- a/tests/draft7/optional/format/date-time.json
+++ b/tests/draft7/optional/format/date-time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date-time strings",
-        "schema": {"format": "date-time"},
+        "schema": { "format": "date-time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date-time string",
                 "data": "1963-06-19T08:30:06.283185Z",
@@ -33,6 +63,11 @@
                 "data": "1990-12-31T15:59:60-24:00",
                 "valid": false
             },
+            {
+                "description": "an invalid closing Z after time-zone offset",
+                "data": "1963-06-19T08:30:06.28123+01:00Z",
+                "valid": false
+            },
             {
                 "description": "an invalid date-time string",
                 "data": "06/19/1963 08:30:06 PST",
diff --git a/tests/draft7/optional/format/date.json b/tests/draft7/optional/format/date.json
index 6cc2feb8..b4f61eed 100644
--- a/tests/draft7/optional/format/date.json
+++ b/tests/draft7/optional/format/date.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of date strings",
-        "schema": {"format": "date"},
+        "schema": { "format": "date" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid date string",
                 "data": "1963-06-19",
diff --git a/tests/draft7/optional/format/email.json b/tests/draft7/optional/format/email.json
index 02396d26..d6761a46 100644
--- a/tests/draft7/optional/format/email.json
+++ b/tests/draft7/optional/format/email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of e-mail addresses",
-        "schema": {"format": "email"},
+        "schema": { "format": "email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid e-mail address",
                 "data": "joe.bloggs@example.com",
diff --git a/tests/draft7/optional/format/hostname.json b/tests/draft7/optional/format/hostname.json
index 476541a8..8a67fda8 100644
--- a/tests/draft7/optional/format/hostname.json
+++ b/tests/draft7/optional/format/hostname.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of host names",
-        "schema": {"format": "hostname"},
+        "schema": { "format": "hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name",
                 "data": "www.example.com",
diff --git a/tests/draft7/optional/format/idn-email.json b/tests/draft7/optional/format/idn-email.json
index 552d1067..6e213745 100644
--- a/tests/draft7/optional/format/idn-email.json
+++ b/tests/draft7/optional/format/idn-email.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of an internationalized e-mail addresses",
-        "schema": {"format": "idn-email"},
+        "schema": { "format": "idn-email" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid idn e-mail (example@example.test in Hangul)",
                 "data": "실례@실례.테스트",
diff --git a/tests/draft7/optional/format/idn-hostname.json b/tests/draft7/optional/format/idn-hostname.json
index 7f10bd83..6c8f86a3 100644
--- a/tests/draft7/optional/format/idn-hostname.json
+++ b/tests/draft7/optional/format/idn-hostname.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of internationalized host names",
-        "schema": {"format": "idn-hostname"},
+        "schema": { "format": "idn-hostname" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid host name (example.test in Hangul)",
                 "data": "실례.테스트",
@@ -91,7 +121,7 @@
             },
             {
                 "description": "Exceptions that are PVALID, right-to-left chars",
-                "comment": "https://tools.ietf.org/html/rfc/rfc5891#section-4.2.2 https://tools.ietf.org/html/rfc5892#section-2.6",
+                "comment": "https://tools.ietf.org/html/rfc5891#section-4.2.2 https://tools.ietf.org/html/rfc5892#section-2.6",
                 "data": "\u06fd\u06fe",
                 "valid": true
             },
diff --git a/tests/draft7/optional/format/ipv4.json b/tests/draft7/optional/format/ipv4.json
index 4d109277..6b166c70 100644
--- a/tests/draft7/optional/format/ipv4.json
+++ b/tests/draft7/optional/format/ipv4.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IP addresses",
-        "schema": {"format": "ipv4"},
+        "schema": { "format": "ipv4" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IP address",
                 "data": "192.168.0.1",
diff --git a/tests/draft7/optional/format/ipv6.json b/tests/draft7/optional/format/ipv6.json
index cf629c60..caad69b1 100644
--- a/tests/draft7/optional/format/ipv6.json
+++ b/tests/draft7/optional/format/ipv6.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IPv6 addresses",
-        "schema": {"format": "ipv6"},
+        "schema": { "format": "ipv6" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IPv6 address",
                 "data": "::1",
diff --git a/tests/draft7/optional/format/iri-reference.json b/tests/draft7/optional/format/iri-reference.json
index 1fd779c2..c6b4c22a 100644
--- a/tests/draft7/optional/format/iri-reference.json
+++ b/tests/draft7/optional/format/iri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRI References",
-        "schema": {"format": "iri-reference"},
+        "schema": { "format": "iri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft7/optional/format/iri.json b/tests/draft7/optional/format/iri.json
index 1414f2e6..a0d12aed 100644
--- a/tests/draft7/optional/format/iri.json
+++ b/tests/draft7/optional/format/iri.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of IRIs",
-        "schema": {"format": "iri"},
+        "schema": { "format": "iri" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid IRI with anchor tag",
                 "data": "http://ƒøø.ßår/?∂éœ=πîx#πîüx",
diff --git a/tests/draft7/optional/format/json-pointer.json b/tests/draft7/optional/format/json-pointer.json
index 65c2f064..a0346b57 100644
--- a/tests/draft7/optional/format/json-pointer.json
+++ b/tests/draft7/optional/format/json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of JSON-pointers (JSON String Representation)",
-        "schema": {"format": "json-pointer"},
+        "schema": { "format": "json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid JSON-pointer",
                 "data": "/foo/bar~0/baz~1/%a",
diff --git a/tests/draft7/optional/format/regex.json b/tests/draft7/optional/format/regex.json
index d99d021e..34491770 100644
--- a/tests/draft7/optional/format/regex.json
+++ b/tests/draft7/optional/format/regex.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of regular expressions",
-        "schema": {"format": "regex"},
+        "schema": { "format": "regex" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid regular expression",
                 "data": "([abc])+\\s+$",
diff --git a/tests/draft7/optional/format/relative-json-pointer.json b/tests/draft7/optional/format/relative-json-pointer.json
index 22fb14e0..9309986f 100644
--- a/tests/draft7/optional/format/relative-json-pointer.json
+++ b/tests/draft7/optional/format/relative-json-pointer.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of Relative JSON Pointers (RJP)",
-        "schema": {"format": "relative-json-pointer"},
+        "schema": { "format": "relative-json-pointer" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid upwards RJP",
                 "data": "1",
diff --git a/tests/draft7/optional/format/time.json b/tests/draft7/optional/format/time.json
index 0a8da0e9..5011d788 100644
--- a/tests/draft7/optional/format/time.json
+++ b/tests/draft7/optional/format/time.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of time strings",
-        "schema": {"format": "time"},
+        "schema": { "format": "time" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid time string",
                 "data": "08:30:06Z",
diff --git a/tests/draft7/optional/format/uri-reference.json b/tests/draft7/optional/format/uri-reference.json
index e4c9eef6..7cdf228d 100644
--- a/tests/draft7/optional/format/uri-reference.json
+++ b/tests/draft7/optional/format/uri-reference.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "validation of URI References",
-        "schema": {"format": "uri-reference"},
+        "schema": { "format": "uri-reference" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid URI",
                 "data": "http://foo.bar/?baz=qux#quux",
diff --git a/tests/draft7/optional/format/uri-template.json b/tests/draft7/optional/format/uri-template.json
index 33ab76ee..df355c55 100644
--- a/tests/draft7/optional/format/uri-template.json
+++ b/tests/draft7/optional/format/uri-template.json
@@ -1,8 +1,38 @@
 [
     {
         "description": "format: uri-template",
-        "schema": {"format": "uri-template"},
+        "schema": { "format": "uri-template" },
         "tests": [
+            {
+                "description": "all string formats ignore integers",
+                "data": 12,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore floats",
+                "data": 13.7,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore objects",
+                "data": {},
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore arrays",
+                "data": [],
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore booleans",
+                "data": false,
+                "valid": true
+            },
+            {
+                "description": "all string formats ignore nulls",
+                "data": null,
+                "valid": true
+            },
             {
                 "description": "a valid uri-template",
                 "data": "http://example.com/dictionary/{term:1}/{term}",
diff --git a/tests/draft7/optional/format/uri.json b/tests/draft7/optional/format/uri.json
index 58d30857..792d71a0 100644
--- a/tests/draft7/optional/format/uri.json
+++ b/tests/draft7/optional/format/uri.json
@@ -1,7 +1,7 @@
 [
     {
         "description": "validation of URIs",
-        "schema": {"format": "uri"},
+        "schema": { "format": "uri" },
         "tests": [
             {
                 "description": "a valid URL with anchor tag",