STINNER Victor <vstin...@python.org> added the comment:
Oh. Or maybe it's related to:
commit 4827483f47906fecee6b5d9097df2a69a293a85c
Author: Inada Naoki <songofaca...@gmail.com>
Date: Mon Mar 29 12:28:14 2021 +0900
bpo-43510: Implement PEP 597 opt-in EncodingWarning. (GH-19481)
See [PEP 597](https://www.python.org/dev/peps/pep-0597/).
* Add `-X warn_default_encoding` and `PYTHONWARNDEFAULTENCODING`.
* Add EncodingWarning
* Add io.text_encoding()
* open(), TextIOWrapper() emits EncodingWarning when encoding is omitted
and warn_default_encoding is enabled.
* _pyio.TextIOWrapper() uses UTF-8 as fallback default encoding used when
failed to import locale module. (used during building Python)
* bz2, configparser, gzip, lzma, pathlib, tempfile modules use
io.text_encoding().
* What's new entry
----------
nosy: +methane
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<https://bugs.python.org/issue43662>
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