Nick Coghlan <ncogh...@gmail.com> added the comment:

Failure to respect isinstance() should be fixed, not documented :)

As far as registering existing functions goes, I also expect registering
lambdas and functools.partial will be popular approaches, so keeping
direct registration is a good idea. There isn't any ambiguity between
the one-argument and two-argument forms.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5135>
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