The answer is that the base32 format is measurably slower than base64, with a cache-hot checkout time of 19.19 seconds (as compared to 15.68 for base64.) So the length of the filenames does matter.
Anyway, I have uploaded the base32 patch onto kernel.org, and I have moved all the git patches into:
At this point, though, I would recommend the base64-flat patch.
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