I cannot find any information on this on the PyPI page. Where is this documented?

The PyPi page states, A version of Tomli, the tomllib module, was added to the standard library in Python 3.11 via [PEP 680](https://www.python.org/dev/peps/pep-0680/). Tomli continues to provide a backport on PyPI for Python versions where the standard library module is not available and that have not yet reached their end-of-life.

It suggests making the following change to allow for a wider compatibility of Python versions

import sys

if sys.version_info >= (3, 11):
    import tomllib
else:
    import tomli as tomllib

tomllib.loads("['This parses fine with Python 3.6+']")

Though would still need tomli_w for output.

Doesn't your PR drop support for Python < 3.11 then? Python 3.8 recently went EOL, but Python 3.9 and 3.10 are still supported for one and two years.

Updated the PR to continue using methods available in Python 3.9 and 3.10