This fixes the bug where adding the same subref to multiple classes fails
to register the method in the method map properly (although the method
does get added to the class, I think).
It also deprecates public access to the method map. Internally, I've done
some refactoring of the method map related code and renamed things a bit,
so the XS code is called _full_method_map (since it scans the symbol
table) and there's a Perl method called just _method_map, which is
basically the hashref as it currently stands, without checking the symbol
table.
-dave
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