Phillip J. Eby <p...@telecommunity.com> added the comment: PyString_AsString() only "works on subclasses" if their internal representation is the same as type str. So we can't say "subclass of str" without *also* specifying that the subclass store its contents in exactly the same way as an object of type str... which means all we've really done is to make the specification longer and more complicated.
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