[issue39011] ElementTree attributes replace "\r" with "\n"

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

I think we did it wrong in issue 17582. Parser behaviour is not a reason why the *serialisation* should modify the content.

Luckily, fixing this does not impact the C14N serialisation (which aims to guarantee byte identical serialisation), but it changes the "normal" serialisation. I would therefore suggest that we remove the newline replacement code in the next release only, Py3.9.

@mefistotelis, do you want to submit a PR?

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stage:  -> needs patch
versions: +Python 3.9 -Python 3.6, Python 3.8

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