diff --git a/lib/json0.js b/lib/json0.js
index 4547e83..01dbe25 100644
--- a/lib/json0.js
+++ b/lib/json0.js
@@ -652,7 +652,7 @@ json.transformComponent = function(dest, c, otherC, type) {
     }
     else if (otherC.oi !== void 0 && otherC.od !== void 0) {
       if (c.p[common] === otherC.p[common]) {
-        if (c.oi !== void 0 && commonOperand) {
+        if (c.oi !== void 0 && commonOperand && !deepEqual(otherC.oi, c.oi)) {
           // we inserted where someone else replaced
           if (type === 'right') {
             // left wins
@@ -669,7 +669,7 @@ json.transformComponent = function(dest, c, otherC, type) {
     } else if (otherC.oi !== void 0) {
       if (c.oi !== void 0 && c.p[common] === otherC.p[common]) {
         // left wins if we try to insert at the same place
-        if (type === 'left') {
+        if (type === 'left' && !deepEqual(otherC.oi, c.oi)) {
           json.append(dest,{p: c.p, od:otherC.oi});
         } else {
           return dest;
diff --git a/package.json b/package.json
index bd99b23..4abe4eb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@reedsy/ot-json0",
-  "version": "1.1.0-reedsy.1.2.5",
+  "version": "1.1.0-reedsy.1.2.6",
   "description": "JSON OT type",
   "main": "lib/index.js",
   "directories": {
diff --git a/test/json0.coffee b/test/json0.coffee
index 85cbf28..d725784 100644
--- a/test/json0.coffee
+++ b/test/json0.coffee
@@ -447,6 +447,26 @@ genTests = (type) ->
       assert.deepEqual [], type.transform [{p:['k'], od:'x'}], [{p:['k'], od:'x'}], 'left'
       assert.deepEqual [], type.transform [{p:['k'], od:'x'}], [{p:['k'], od:'x'}], 'right'
 
+    it 'An attempt to re-add a key with an identical string becomes a no-op', ->
+      assert.deepEqual [], type.transform [{p:['k'], oi:'x'}], [{p:['k'], oi:'x'}], 'left'
+      assert.deepEqual [], type.transform [{p:['k'], oi:'x'}], [{p:['k'], oi:'x'}], 'right'
+
+    it 'An attempt to re-replace a key with an identical string becomes a no-op', ->
+      assert.deepEqual [], type.transform [{p:['k'], oi:'x', od: 'a'}], [{p:['k'], oi:'x', od: 'a'}], 'left'
+      assert.deepEqual [], type.transform [{p:['k'], oi:'x', od: 'a'}], [{p:['k'], oi:'x', od: 'a'}], 'right'
+
+    it 'An attempt to re-replace a key with an identical string becomes a no-op', ->
+      assert.deepEqual [], type.transform [{p:['k'], oi:'x', od: 'a'}], [{p:['k'], oi:'x', od: 'b'}], 'left'
+      assert.deepEqual [], type.transform [{p:['k'], oi:'x', od: 'a'}], [{p:['k'], oi:'x', od: 'b'}], 'right'
+
+    it 'An attempt to re-add a key with an identical object becomes a no-op', ->
+      assert.deepEqual [], type.transform [{p:['k'], oi:{}}], [{p:['k'], oi:{}}], 'left'
+      assert.deepEqual [], type.transform [{p:['k'], oi:{}}], [{p:['k'], oi:{}}], 'right'
+
+    it 'An attempt to re-replace a key with an identical object becomes a no-op', ->
+      assert.deepEqual [], type.transform [{p:['k'], oi:{}, od: 'a'}], [{p:['k'], oi:{}, od: 'a'}], 'left'
+      assert.deepEqual [], type.transform [{p:['k'], oi:{}, od: 'a'}], [{p:['k'], oi:{}, od: 'a'}], 'right'
+
     it 'throws when the deletion target does not match', ->
       assert.throws -> type.apply {x:'a'}, [{p:['x'], od: 'b'}]
       assert.throws -> type.apply {x:'a'}, [{p:['x'], oi: 'c', od: 'b'}]