[issue15870] PyType_FromSpec should take metaclass as an argument

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

- specs/slots are (usually) constant & static; pointers to types are not always C constant expressions (on Windows, if they come from a different DLL)
- specs/slots are (usually) shared across all subinterpreters; types are specific to a single interpreter

It's better to pass the metaclass as a function argument, as with bases. I'd prefer adding a new function that using a slot.

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<https://bugs.python.org/issue15870>
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