[issue43689] difflib: mention other "problematic" characters in documentation

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

Terry, your suggested replacement statement looks like an improvement to me. Perhaps the longer explanation could be placed in a footnote.

Note that I'm old ;-) I grew up on plain old ASCII, decades & decades ago, and tabs are in fact the only "characters" I've had a problem with in doctests. But then, e.g., I never in my life used goofy things like ASCII "form feed" characters, or NUL bytes, or ... in text either.

I don't use Unicode either, except to the extent that Python forces me to when I'm sticking printable ASCII characters inside string quotes ;-)

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