`glob.glob('**/**', recursive=True)` yields duplicate results

[barneygale]

Calling glob.glob(pattern, recursive=True), where pattern contains two or more **/ segments, can yield the same paths multiple times:

>>> import glob
>>> len(glob.glob('**/**', recursive=True))
314206
>>> len(set(glob.glob('**/**', recursive=True)))
44849

Linked PRs

• gh-104269: Document glob.glob duplicates when using multiple ** patterns #105406
• [3.12] gh-104269: Document glob.glob duplicates when using multiple ** patterns (GH-105406) #117757

[barneygale]

Reasonably minor bug I think as these patterns are pretty rare. A note in the docs might be the best solution.