Remove code for encoding float32

driver.Value values are always float64

encode.go

@@ -18,8 +18,6 @@ func encode(parameterStatus *parameterStatus, x interface{}, pgtypOid oid.Oid) [
 	switch v := x.(type) {
 	case int64:
 		return []byte(fmt.Sprintf("%d", v))
-	case float32:
-		return []byte(fmt.Sprintf("%.9f", v))
 	case float64:
 		return []byte(fmt.Sprintf("%.17f", v))
 	case []byte:
@@ -87,8 +85,6 @@ func appendEncodedText(parameterStatus *parameterStatus, buf []byte, x interface
 	switch v := x.(type) {
 	case int64:
 		return strconv.AppendInt(buf, v, 10)
-	case float32:
-		return strconv.AppendFloat(buf, float64(v), 'f', -1, 32)
 	case float64:
 		return strconv.AppendFloat(buf, v, 'f', -1, 64)
 	case []byte:

encode_test.go

@@ -510,15 +510,13 @@ func TestAppendEncodedText(t *testing.T) {
 
 	buf = appendEncodedText(&parameterStatus{serverVersion: 90000}, buf, int64(10))
 	buf = append(buf, '\t')
-	buf = appendEncodedText(&parameterStatus{serverVersion: 90000}, buf, float32(42.0000000001))
-	buf = append(buf, '\t')
 	buf = appendEncodedText(&parameterStatus{serverVersion: 90000}, buf, 42.0000000001)
 	buf = append(buf, '\t')
 	buf = appendEncodedText(&parameterStatus{serverVersion: 90000}, buf, "hello\tworld")
 	buf = append(buf, '\t')
 	buf = appendEncodedText(&parameterStatus{serverVersion: 90000}, buf, []byte{0, 128, 255})
 
-	if string(buf) != "10\t42\t42.0000000001\thello\\tworld\t\\\\x0080ff" {
+	if string(buf) != "10\t42.0000000001\thello\\tworld\t\\\\x0080ff" {
 		t.Fatal(string(buf))
 	}
 }