[issue32723] codecs.open silently ignores argument errors

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

On both Py2 and Py3, calling codecs.open without passing an encoding argument is equivalent to adding 'b' to the mode string and calling the built-in open function directly; it returns a plain binary mode file object. The errors parameter is meaningless because no decoding is being performed (there will never be any errors to handle).

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nosy: +josh.r

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<https://bugs.python.org/issue32723>
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