CSafeDumper doesn't appear to respect allow_unicode=True

[indrat]

The behaviour of CSafeDumper differs from SafeDumper with respect to the allow_unicode parameter. SafeDumper will emit the unicode unescaped whereas CSafeDumper appears to ignore the parameter and emits the \U.... escaped version of the unicode character.

Is this expected?

Example:

Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
PyYAML     6.0.1

>>> import yaml
>>> text = "😸 is not escaped"
>>> print(yaml.dump_all([text], encoding="utf-8", allow_unicode=True, Dumper=yaml.SafeDumper).decode("utf-8"))
😸 is not escaped

>>> print(yaml.dump_all([text], encoding="utf-8", allow_unicode=True, Dumper=yaml.CSafeDumper).decode("utf-8"))
"\U0001F638 is not escaped"