[issue13968] Support recursive globs

[Nick Coghlan]

Nick Coghlan added the comment:

Mostly looks good to me, just two comments:

1. Is there a reason the helper function is "glob2" rather than either "_glob2" or else something more self-documenting?

2. "match a files" in the docs and docstrings doesn't read correctly. "match any files", perhaps?

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