[issue28765] _sre.compile(): be more strict on types of indexgroup and groupindex

[STINNER Victor]

STINNER Victor added the comment:

sre-concrete.patch is wrong: if groupindex is a subtype of dict, you should use PyObject_GetItem.

I like the idea of using PyDict_GetItem, you should just implement stricter checks in _sre.compile(). Maybe using PyDict_CheckExact?

Since it's a private module, we don't have to support all types. It's ok to implement further optimizations.

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