One problem is the naming of audit events. Actually I didn't even notice that `_xxsubinterpreters` was already there since Python 3.8, because PEP 554 is still in draft status as for now. Looks like `_xxsubinterpreters` is an internal low-level interface to subinterpreters (and probably only meant for testing purposes for now), while PEP 554 will bring a high-level interface `interpreters` for users. Naming the audit events as `interpreters.*` will be more readable, although the `interpreters` module doesn't actually exist today.