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

[Nick Coghlan]

Nick Coghlan added the comment:

The problem we're trying to solve is CPython *silently* breaking subclass
invariants, which is what the concrete APIs currently do. At the moment,
trying to swap out dicts with ordered dicts in various places will corrupt
the ordered dict instead of calling the appropriate subclass methods or
throwing a type error.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10977>
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