[issue40170] [C API] Make PyTypeObject structure an opaque structure in the public C API

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Thanks for doing this.  I can confirm the performance regression is fixed and that clean code is being generated for PyTuple_Check().

BTW, I support your efforts — just wanted to make sure we didn't unintentionally take a step backwards.

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nosy: +rhettinger

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