Add simpler api to ignore default value in WriteMember (#1236)

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649;xUnit1026;xUnit1013;CS1573;VerifyTestsProjectDir;VerifySetParameters;PolyFillTargetsForNuget</NoWarn>
-    <Version>25.0.4</Version>
+    <Version>25.1.0</Version>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>preview</LangVersion>
     <AssemblyVersion>1.0.0</AssemblyVersion>

src/StrictJsonTests/SerializationTests.WithConverterIgnoreDefault.verified.json

@@ -0,0 +1,6 @@
+{
+  "withDefault": {},
+  "withNonDefault": {
+    "Name": "Value"
+  }
+}

src/Verify.Tests/Serialization/SerializationTests.WithConverterIgnoreDefault.verified.txt

@@ -0,0 +1,6 @@
+{
+  withDefault: {},
+  withNonDefault: {
+    Name: Value
+  }
+}

src/Verify.Tests/Serialization/SerializationTests.cs

@@ -3751,6 +3751,33 @@ class ConverterTarget
         public string Name { get; set; } = null!;
     }
 
+    [Fact]
+    public Task WithConverterIgnoreDefault() =>
+        Verify(
+                new
+                {
+                    withDefault = new ConverterTarget
+                    {
+                        Name = "Ignore"
+                    },
+                    withNonDefault = new ConverterTarget
+                    {
+                        Name = "Value"
+                    },
+                })
+            .AddExtraSettings(_ => _.Converters.Add(new ConverterIgnoreDefault()));
+
+    class ConverterIgnoreDefault :
+        WriteOnlyJsonConverter<ConverterTarget>
+    {
+        public override void Write(VerifyJsonWriter writer, ConverterTarget target)
+        {
+            writer.WriteStartObject();
+            writer.WriteMember(target, target.Name, "Name", "Ignore");
+            writer.WriteEnd();
+        }
+    }
+
     [Fact]
     public Task WithRecursiveConverter() =>
         Verify(new RecursiveConverterTarget())

src/Verify/Serialization/VerifyJsonWriter.cs

@@ -184,6 +184,26 @@ public override void WriteValue(Guid value)
         WriteRawValueWithScrubbers(buffer);
     }
 
+
+    /// <summary>
+    /// Writes a property name and value while respecting other custom serialization settings.
+    /// </summary>
+    public void WriteMember<T>(object target, T? value, string name, T defaultIgnore)
+        where T : IEquatable<T?>
+    {
+        if (value is null)
+        {
+            return;
+        }
+
+        if (value.Equals(defaultIgnore))
+        {
+            return;
+        }
+
+        WriteMember(target, value, name);
+    }
+
     /// <summary>
     /// Writes a property name and value while respecting other custom serialization settings.
     /// </summary>