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aeaa5fc1b1
This fixes a bug where repeated use of ** didn't behave as it should. In particular, each use of `**` added a new requirement directory depth requirement. For example, something like `**/**/b` would match `foo/bar/b`, but it wouldn't match `foo/b` even though it should. In particular, `**` semantics demand "infinite" depth, so repeated uses of `**` should just coalesce as if only one was given. We do this coalescing in the parser. It's a little tricky because we treat `**/a`, `a/**` and `a/**/b` as distinct tokens with their own regex conversions. We also test the crap out of it. Fixes #1174