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Quick patch attached. I didn't try to use the PyDict_GetItem trick described, but just systematically use PyObject_GetItem/SetItem/DelItem when working with f_locals.
This might confuse some extension modules that expect PyEval_GetLocals() to return a dict object.
The eval trick is now: eval(code, nondict) --> eval(code, globals(), nondict).
Besides eval() I removed the relevant typecheck from execfile() and the exec statement. Any other place I am missing?
We might want to still somehow check the type of the locals, to avoid strange errors caused by e.g. eval("a", "b"). PyMapping_Check() is the obvious candidate, but it looks like a hack.
More testing is needed. test_descrtut.py line 84 now succeeds, unexpectedly, which is interpreted as a test failure.
Needs some docs, too.