[issue13997] Add open_ascii() builtin

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

@Bendersky:

Unlike open()'s other arguments, that one wouldn't be orthogonal though. It would be possible to write e.g.:

f = open(fname, encoding="big5", errors="replace", ascii_only=True)

which seems disturbing, IMO. It would be nicer to rule out such impossible combinations categorically.

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<http://bugs.python.org/issue13997>
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