Use round-trip for serializing floats serializes more accurately

Author: mythz

src/ServiceStack.Text/Json/JsonTypeSerializer.cs

@@ -281,7 +281,7 @@ public void WriteFloat(TextWriter writer, object floatValue)
                 if (Equals(floatVal, float.MaxValue) || Equals(floatVal, float.MinValue))
                     writer.Write(floatVal.ToString("r", CultureInfo.InvariantCulture));
                 else
-                    writer.Write(floatVal.ToString(CultureInfo.InvariantCulture));
+                    writer.Write(floatVal.ToString("r", CultureInfo.InvariantCulture));
             }
         }
 

src/ServiceStack.Text/Jsv/JsvTypeSerializer.cs

@@ -233,7 +233,7 @@ public void WriteFloat(TextWriter writer, object floatValue)
             if (Equals(floatVal, float.MaxValue) || Equals(floatVal, float.MinValue))
                 writer.Write(floatVal.ToString("r", cultureInfo ?? CultureInfo.InvariantCulture));
             else
-                writer.Write(floatVal.ToString(cultureInfo ?? CultureInfo.InvariantCulture));
+                writer.Write(floatVal.ToString("r", cultureInfo ?? CultureInfo.InvariantCulture));
         }
 
         public void WriteDouble(TextWriter writer, object doubleValue)

tests/ServiceStack.Text.Tests/JsvTests/JsvBasicDataTests.cs

@@ -16,20 +16,20 @@ public void Can_serialize_ModelWithFloatTypes()
             };
 
             var jsv = dto.ToJsv();
-            Assert.That(jsv,Is.EqualTo("{Float:1.1,Double:2.2,Decimal:3.3}"));
+            Assert.That(jsv, Is.EqualTo("{Float:1.1,Double:2.2,Decimal:3.3}"));
 
             var fromJsv = jsv.FromJsv<ModelWithFloatTypes>();
             Assert.That(fromJsv, Is.EqualTo(dto));
 
             dto = new ModelWithFloatTypes
             {
-                Float   = 1111111.11f,
-                Double  = 2222222.22d,
-                Decimal = 33333333.33m
+                Float = 111111.1f,
+                Double = 2222222.22d,
+                Decimal = 33333333.333m
             };
 
             jsv = dto.ToJsv();
-            Assert.That(jsv, Is.EqualTo("{Float:1111111,Double:2222222.22,Decimal:33333333.33}"));
+            Assert.That(jsv, Is.EqualTo("{Float:111111.1,Double:2222222.22,Decimal:33333333.333}"));
 
             fromJsv = jsv.FromJsv<ModelWithFloatTypes>();
             Assert.That(fromJsv, Is.EqualTo(dto));