[issue27561] Warn against subclassing builtins, and overriding their methods

[R. David Murray]

R. David Murray added the comment:

It doesn't just apply to dicts, it applies to all the built in collection types (and possibly to other built in types).  But not to all the methods, which will make the documentation somewhat vague ("you may not be able to successfully override base class methods such as __setitem__...")  Oh, and I suppose it needs to be marked as a CPython implementation detail.

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<http://bugs.python.org/issue27561>
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