diff --git a/samples/jsonrpc_with_published_objects/MyObjectU.pas b/samples/jsonrpc_with_published_objects/MyObjectU.pas
index eb990af50..7a1479397 100644
--- a/samples/jsonrpc_with_published_objects/MyObjectU.pas
+++ b/samples/jsonrpc_with_published_objects/MyObjectU.pas
@@ -176,10 +176,10 @@ function TMyObject.GetPeopleDataset: TFDMemTable;
 function TMyObject.GetStringDictionary: TMVCStringDictionary;
 begin
   Result := TMVCStringDictionary.Create;
-  Result.AddProperty('key1', 'value1');
-  Result.AddProperty('key2', 'value2');
-  Result.AddProperty('key3', 'value3');
-  Result.AddProperty('key4', 'value4');
+  Result.Add('key1', 'value1');
+  Result.Add('key2', 'value2');
+  Result.Add('key3', 'value3');
+  Result.Add('key4', 'value4');
 end;
 
 function TMyObject.GetUser(aUserName: string): TPerson;
diff --git a/samples/renders_spring4d_nullables/CustomTypesSerializersU.pas b/samples/renders_spring4d_nullables/CustomTypesSerializersU.pas
index c8bf5555d..e7e1b74d4 100644
--- a/samples/renders_spring4d_nullables/CustomTypesSerializersU.pas
+++ b/samples/renders_spring4d_nullables/CustomTypesSerializersU.pas
@@ -28,7 +28,7 @@ interface
 
 uses
   MVCFramework.Serializer.Intf,
-  System.Rtti;
+  System.Rtti, MVCFramework.Serializer.Commons;
 
 type
   // Custom serializer for TNullableAliasSerializer type
@@ -43,7 +43,8 @@   TNullableIntegerSerializer = class(TInterfacedObject, IMVCTypeSerializer)
     procedure SerializeRoot(
       const AObject: TObject;
       out ASerializerObject: TObject;
-      const AAttributes: TArray<TCustomAttribute>
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
       );
 
     procedure DeserializeAttribute(
@@ -77,7 +78,8 @@   TNullableCurrencySerializer = class(TInterfacedObject, IMVCTypeSerializer)
     procedure SerializeRoot(
       const AObject: TObject;
       out ASerializerObject: TObject;
-      const AAttributes: TArray<TCustomAttribute>
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
       );
 
     procedure DeserializeAttribute(
@@ -111,7 +113,8 @@   TNullableStringSerializer = class(TInterfacedObject, IMVCTypeSerializer)
     procedure SerializeRoot(
       const AObject: TObject;
       out ASerializerObject: TObject;
-      const AAttributes: TArray<TCustomAttribute>
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
       );
 
     procedure DeserializeAttribute(
@@ -145,7 +148,8 @@   TPersonSerializer = class(TInterfacedObject, IMVCTypeSerializer)
     procedure SerializeRoot(
       const AObject: TObject;
       out ASerializerObject: TObject;
-      const AAttributes: TArray<TCustomAttribute>
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
       );
 
     procedure DeserializeAttribute(
@@ -173,8 +177,7 @@ implementation
   Spring,
   MVCFramework.Serializer.JsonDataObjects,
   BusinessObjectsU,
-  System.SysUtils,
-  MVCFramework.Serializer.Commons;
+  System.SysUtils;
 
 procedure TNullableIntegerSerializer.Deserialize(const ASerializedObject: TObject;
   var AElementValue: TValue; const AAttributes: TArray<TCustomAttribute>);
@@ -224,8 +227,12 @@ procedure TNullableIntegerSerializer.SerializeAttribute(const AElementValue: TVa
     (ASerializerObject as TJDOJsonObject).Values[APropertyName] := nil;
 end;
 
-procedure TNullableIntegerSerializer.SerializeRoot(const AObject: TObject;
-  out ASerializerObject: TObject; const AAttributes: TArray<TCustomAttribute>);
+procedure TNullableIntegerSerializer.SerializeRoot(
+      const AObject: TObject;
+      out ASerializerObject: TObject;
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
+      );
 begin
   raise EMVCSerializationException.Create('Not supported');
 end;
@@ -281,8 +288,12 @@ procedure TNullableCurrencySerializer.SerializeAttribute(const AElementValue: TV
     (ASerializerObject as TJDOJsonObject).Values[APropertyName] := nil;
 end;
 
-procedure TNullableCurrencySerializer.SerializeRoot(const AObject: TObject;
-  out ASerializerObject: TObject; const AAttributes: TArray<TCustomAttribute>);
+procedure TNullableCurrencySerializer.SerializeRoot(
+      const AObject: TObject;
+      out ASerializerObject: TObject;
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
+      );
 begin
   raise EMVCSerializationException.Create('Not supported');
 end;
@@ -338,8 +349,12 @@ procedure TNullableStringSerializer.SerializeAttribute(const AElementValue: TVal
     (ASerializerObject as TJDOJsonObject).Values[APropertyName] := nil;
 end;
 
-procedure TNullableStringSerializer.SerializeRoot(const AObject: TObject;
-  out ASerializerObject: TObject; const AAttributes: TArray<TCustomAttribute>);
+procedure TNullableStringSerializer.SerializeRoot(
+      const AObject: TObject;
+      out ASerializerObject: TObject;
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
+      );
 begin
   raise EMVCSerializationException.Create('Not supported');
 end;
@@ -382,8 +397,12 @@ procedure TPersonSerializer.SerializeAttribute(const AElementValue: TValue;
   TJDOJsonObject(ASerializerObject).O[APropertyName] := lJSON;
 end;
 
-procedure TPersonSerializer.SerializeRoot(const AObject: TObject;
-  out ASerializerObject: TObject; const AAttributes: TArray<TCustomAttribute>);
+procedure TPersonSerializer.SerializeRoot(
+      const AObject: TObject;
+      out ASerializerObject: TObject;
+      const AAttributes: TArray<TCustomAttribute>;
+      const ASerializationAction: TMVCSerializationAction = nil
+      );
 var
   lPerson: TPerson;
   lJSON: TJDOJsonObject;
diff --git a/samples/renders_spring4d_nullables/MainControllerU.pas b/samples/renders_spring4d_nullables/MainControllerU.pas
index b7e5a0f0f..e451dabea 100644
--- a/samples/renders_spring4d_nullables/MainControllerU.pas
+++ b/samples/renders_spring4d_nullables/MainControllerU.pas
@@ -63,9 +63,9 @@ procedure TMyController.GetDictionary;
   lDict: TMVCStringDictionary;
 begin
   lDict := TMVCStringDictionary.Create;
-  lDict.AddProperty('prop1', 'one');
-  lDict.AddProperty('prop2', 'two');
-  lDict.AddProperty('prop3', 'three');
+  lDict.Add('prop1', 'one');
+  lDict.Add('prop2', 'two');
+  lDict.Add('prop3', 'three');
   Render(lDict);
 end;
 
diff --git a/sources/MVCFramework.ActiveRecordController.pas b/sources/MVCFramework.ActiveRecordController.pas
index d6afd2ea7..abc5f8189 100644
--- a/sources/MVCFramework.ActiveRecordController.pas
+++ b/sources/MVCFramework.ActiveRecordController.pas
@@ -153,7 +153,7 @@ procedure TMVCActiveRecordController.GetEntities(const entityname: string);
 
     lResp := TMVCActiveRecordListResponse.Create(TMVCActiveRecord.SelectRQL(lARClassRef, lRQL, GetMaxRecordCount), True);
     try
-      lResp.Metadata.AddProperty('count', lResp.Items.Count.ToString);
+      lResp.Metadata.Add('count', lResp.Items.Count.ToString);
       Render(lResp);
     except
       lResp.Free;
diff --git a/sources/dmvcframeworkbuildconsts.inc b/sources/dmvcframeworkbuildconsts.inc
index d6f61bcc6..9b19763ae 100644
--- a/sources/dmvcframeworkbuildconsts.inc
+++ b/sources/dmvcframeworkbuildconsts.inc
@@ -1,2 +1,2 @@
 const
-  DMVCFRAMEWORK_VERSION = '3.1.1 (beryllium) RC2';
\ No newline at end of file
+  DMVCFRAMEWORK_VERSION = '3.1.1 (beryllium) RC3';
\ No newline at end of file
diff --git a/tasks.py b/tasks.py
index 7ec48e799..2e0179460 100644
--- a/tasks.py
+++ b/tasks.py
@@ -108,6 +108,7 @@ def copy_sources():
     ]
 
     folders = [
+        "d100",	
         "d101",
         "d102",
         "d103"