[issue21075] fileinput should use stdin.buffer for "rb" mode

[Josh Rosenberg]

Josh Rosenberg added the comment:

There is a similar, (unfixed?) bug, #14156, in argparse as well. Seems like a common failing in the move to Python 3; std*.buffer was introduced, but none of the places that use it were updated, so they all became str only.

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nosy: +josh.rosenberg

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