OnClick() area doesn't recheck functions, after changing script

2) How can we reproduce it using the example you attached

Please see attached video

1 Create new project
2 Add Menu->GameObject->UI->Button
3 Assign script with public function to any GameObject

public void Test1(string text)
{
Debug.Log ("Test1: " text);
}

4 Add this function to OnClick() event using UI (in Inspector)
5 Change function to
public int Test1(string text)
{
Debug.Log ("Test1: " text);
return 0;
}
Actual result: the function is still assigned in Inspector, but is not available anymore to choose

Question: Should it be reset to No Function or throw warning after script reload?