[docs] [issue10977] Concrete object C API considered harmful to subclasses of builtin types

[Stefan Krah]

Stefan Krah added the comment:

I'm also in favor of a clean separation between the concrete and abstract
APIs (see also #12965).  Why can't the concrete functions be locked down
with *CheckExact()?  If there's any breakage in third party modules,
it's easy to fix (probably much easier than the Unicode changes in 3.3).

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nosy: +skrah

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<http://bugs.python.org/issue10977>
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