C # Resolution overload method

I have the following methods:

    static void OverloadedMethod(Action<ulong> handlerAction)
    {            
    }

    static void OverloadedMethod(Action<float> handlerAction)
    {
    }

    static void HandlerA(ulong dataProgress)
    {
    }

    static void HandlerB(float dataProgress)
    {
    }

      

        
        
        
      

    

I can call

OverloadedMethod(HandlerA);

      

        
        
        
      

    

no problem, but if i try to call

OverloadedMethod(HandlerB);

      

        
        
        
      

    

The compiler complains: Ambiguous call.

I read this article , but I don't understand why the compiler knows which method to choose if the parameter is ulong, but it cannot solve the same situation if the parameter is a float ...