[issue10954] No warning for csv.writer API change

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

The API change would be generating an error if newline='' wasn't specified.  Amplifying the bytes-case error message would be fine, though.  On the other hand, we are in RC phase, and I'm not at all sure this is important enough to go in to an RC.  On the gripping hand it is also trivial enough that Georg might approve it.

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nosy: +georg.brandl

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