Is there any hack to know the actual concrete class of the generic of an instance at runtime?

I'd like to find a hack to infer the actual generic instance of another instance's var in runtime, without:

• Changing my method signature (adding class..., the obvious way)

• Having to instanceOf all posiible subtypes in a hardcoded way

  MyInterface<? extends Number> myInterface = whateverReturnsWildcardDoubleInterface();
  Class<?> type = inferInstanceType(myInterface);
  assert type == Double.class;  
  
  /** This is the method that represents the code I am looking for  with the conrete signature**/
  public <T extends Number> Class<T> inferInstanceType(MyInterface<T> myInterface){
      return T.class; //Concrete T (can or cannot be the very Number)  
  }
  
  

Ideally, it should return Double when T is particular subtype Integer,Double.. and Number when T is Number

I checked reflection, several "TypeResolver"/"GenericResolver" libs (as the one in Spring or others in Github), but I cannot fin a way to hack it.