[issue16837] Number ABC can be instantiated

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Attached patch fixes the issue and passes regression tests, so most likely the ability to instantiate Number is not an intentional feature.

"pass" should probably be replaced with a meaningful docstring, but I would like to hear from others on whether the solution is conceptually correct before making it commit-ready.

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keywords: +patch
nosy: +eric.araujo, ncoghlan, rhettinger
stage:  -> patch review
Added file: http://bugs.python.org/file28531/issue16837.diff

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