Improve :o/:open path ordering

[mway]

I searched for a bit but didn't see anything related, apologies if this is a dupe.

I noticed that when using :o to open files, tab completion does not prefer exact/closest match, which means more tabbing/typing is required than should be necessary. If I had to guess it's because file extension is not being treated differently from filename (or at least, as a match boundary).

For example, assume I have the following tree:

./
  foo.bar
  foo_baz.bat

If I :o foo (but do not hit enter), foo_baz.bat is the first item in the list, whereas I would expect foo.bar to be first as it is a closer match.

This is also the case outside of extensions, for example:

./
  foo/
    ...
  foo-bar/
    ...

If I :o foo again here, foo-bar will be first in the list. This case is worse IMO as we're preferring a non-exact match to an exact match.

Is there a setting I'm not seeing that controls this? If not, would it be possible to adjust sorting to prefer closer/exact matches?