[issue25439] Add type checks to urllib.request.Request

[Sanyam Khurana]

Sanyam Khurana <sanyam.khurana01 at gmail.com> added the comment:

I'm working on applying the patch cleanly to master branch for this.

Also adding 3.8 and 3.7 as candidates for the bug.

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versions: +Python 3.7, Python 3.8

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<https://bugs.python.org/issue25439>
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