[issue27984] singledispatch register should typecheck its argument

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:

Cheryl, It's a good remind for me. I totally forget about this issue.

> Since Xiang is a core developer, I thought he would be in the position to make the decision about moving forward with the patch.

Yes, I made the decision. But seems not a wise one, sorry. :-( But fortunately Łukasz noticed it. :-)

I am happy to see finally this issue is solved, instead of hanging with no reply. :-) Thanks for Łukasz and Cheryl.

I am sorry for the PRs making noise here. Again, it's quite all right for me to close them. :-)

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<https://bugs.python.org/issue27984>
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