[issue23214] BufferedReader.read1(size) signature incompatible with BufferedIOBase.read1(size=-1)

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2af6d94de492 by Martin Panter in branch 'default':
Issue #23214: Fix formatting of -1
https://hg.python.org/cpython/rev/2af6d94de492

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