> Knowing that there are two constructors that exist for normal, non-native, Python classes, and that the basic constructoe Class.__new__, and that the constructor Class() itself calls Class.__new__() and then, if Class.__new__() returns an instance i of Class, also calls Class.__init__(i) before returning i, is pretty basic Python knowledge.

I disagree that this is basic knowledge. In python a callable is an object whose type has a __call__() method. So when we see Class() its just a syntax proxy for Metaclass.__call__(Class). That's the true (first of three?) constructor, the one then calling instance = Class.__new__(cls), and soon after Class.__init__(instance), to finally return instance.

That's not basic knowledge.