Prefer more specific update method over less specific update method in subscriber

Assume a subscriber class has two update methods:

class TestSubscriber

The first update method is a more specific footprint then the second method. It would be nice if the engine, when a subscriber with multiple suitable update methods is provided, chooses the most specific in terms of parameter types matching the select clause.

This is assigned to version 5 as any 4.x version must be consistent in the update-method chosen.