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One message is wrong, in typeobject.c:slot_tp_hash().
The object that is unhashable is not 'func', it is 'self'.

In abstract.c, maybe the two error messages from
PySequence_Size() and PyMapping_Size() should be different,
as they depend on the presence of a different slot.  I'd
suggest, respectively, "len() of non-sequence object
'%.200s'" and "len() of non-mapping object '%.200s'".

The rest looks good and quite useful IMHO :-)