[issue3359] add 'rbU' mode to open()

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

> If you open file with 'r' - all line endings will be mapped precisely to
> '\n' anyways, so it has nothing to do with 'U' mode.

No they won't -- only the platform-specific newline will. On Unix, 'r'
and 'rb' are the same.

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nosy: +georg.brandl

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