anchor.diff:  constructor TNullableTime.Create(aValue: TDateTime);
   begin
     inherited Create;
  -  FValue := aValue;
  +  SetValue(aValue);
   end;
   
   procedure TNullableTime.Assign(const aSource: TNullableTime);
  
positive.code: constructor TNullableString.Create(aValue: String);
  begin
    inherited Create;
    Self.Value:= aValue;
  end;
  
  procedure TNullableString.Assign(const aSource: TNullableString);
  
negative.code: constructor TNullableInteger.Create(aValue: Integer);
  begin
    inherited Create;
    SetValue(aValue);
  end;
  
  procedure TNullableInteger.Assign(const aSource: TNullableInteger);
  