[issue24597] forbid redefinition of specializations in singledispatch

[Antoine Pitrou]

Antoine Pitrou added the comment:

Ah, but I wasn't suggesting to add an argument to the .register() call, but to the singledispatch() call; i.e. it would be a function-wide parameter.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24597>
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