[issue36311] Flaw in Windows code page decoder for large input

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I'll get the 3.7 and 3.8 backports merged - looks like they're trivial. 

Going to need some help with the 2.7 backport, but I'm happy to approve a PR.

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stage: patch review -> backport needed

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<https://bugs.python.org/issue36311>
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