[issue24597] forbid redefinition of specializations in singledispatch

[Ethan Furman]

Ethan Furman added the comment:

Sure.  I just saying that

@f.register(int, replace=True)

requires opt-in to replacing, whilst

@f.register(int, replace=False) # don't replace if one already exists

is still prone to bugs.

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