[rraval]

I called it funky because `x` is never local to `inner`, but gets an entry inside `locals()` if `inner` uses it implicitly or explicitly with `nonlocal`.

Non-funky behaviour would be to have an `enclosing()` that walks up the outer functions and returns the union of their `locals()`. Alternatively, a `vars()` which expands to all variables in scope (respecting LEGB) would be best given the context of variable interpolation.