[issue43126] IOBase.readlines(0) behaviour is inconsistent with documentation

[Andrei Kulakov]

Andrei Kulakov <andrei.avk at gmail.com> added the comment:

Thanks for the report!

I agree docs could be improved. Note this method lives in `IOBase` so this behavior also applies to the file pointer returned from `open()` builtin.

I've put up the PR here: https://github.com/python/cpython/pull/27061/files

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