anchor.diff:  
   implementation
   
  +{ MZString }
   
   class method MZString.getType: MZType;
   begin
  
positive.code: begin
    if self = nil then exit nil;
    exit mono_string_from_utf16(^mono_unichar2(self.cStringUsingEncoding(NSStringEncoding.NSUnicodeStringEncoding)));
  end;
  
  method MZArray.objectAtIndex(aIndex: Integer): id;
  
negative.code:   state^.mutationsPtr := nil;
  end;
  
  { MZObjectList }
  
  constructor MZObjectList withMonoInstance(aInst: ^MonoObject) elementType(aType: &Class);
  begin
  