Guido van Rossum <gu...@python.org> added the comment:

Hm, this change allows many other *undesirable* objects pass the test as well. 
I'd prefer to stick to the rule, "when in doubt, raise an error".
Maybe using == instead of 'is' as the test would be acceptable?

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nosy: +gvanrossum

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<http://bugs.python.org/issue13479>
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