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

[Nick Coghlan]

Nick Coghlan added the comment:

I haven't fully thought this one through, but perhaps we could:
- deprecate calling the current concrete APIs with subclasses (since doing
so may break subclass invariants)
- add "PyBaseDict_*" APIs (etc) that subclass implementations can call.
- offer a compatibility header for earlier versions that #defines the new
APIs back to the old ones

This would be 3.5 PEP territory, though.

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