> Hopefully tomli being less than a year old should not be a blocker, after all, TOML v1.0.0 is itself less than a year old.

It's actually rather important as the semantics of how things work will effectively be locked in once a module is added to the stdlib, so we need to be careful. Plus had you asked this question less than a year go the answer would have been pypi.org/p/toml and now you're suggesting something different, so the year matters. 😄