Issue #20335: bytes constructor now raises TypeError when encoding or errors
is specified with non-string argument.  Based on patch by Renaud Blanch.

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branch : 3.4
Fix the test to use an os.sep agnostic test.  Hopefully this will fix the
Windows buildbots.  Found by Jeremy Kloth.

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branch : 3.4
Close #22473: asyncio doc: rephrase Future with run_forever() example

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branch : 3.4
Closes #22475: asyncio doc, fix Task.get_stack() doc

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branch : 3.4