Daniel Urban <urban.dani...@gmail.com> added the comment: I think, that the reason is that, object.__new__ checks, if the class is instantiable (object_new in Objects/typeobject.c ). dict.__new__ (and tuple.__new__, and I guess the __new__ method of other built-in types) doesn't call object.__new__, but user defined types typically either doesn't have a __new__, or call object.__new__ from it (directly or with super).
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