[issue20747] Charset.header_encode in email.charset doesn't take a maxlinelen argument and has inconsistent behavior with different encodings

[Rik]

Rik added the comment:

Ok, so you suggest to use `maxlinelen=None` for the `base64mime.header_encode` which will act the same as giving `maxlinelen=None` to `email.quoprimime`, so that we don't need to change the API?

And this change would then also be reflected in the Python 3.5 legacy interface?

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