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The previous version requires it and failed if they weren't,
the present version still requires it, but missing entries
are added in the read_directory() function (around line
542). So it's guaranteed they're there if needed.

I could have solved it differently at import time, but I
thought it be better to do slightly more work at
zipdirectory-read time so we have to do less work later. I
doubt it matters much in reality, this was just the simplest
way to solve the problem...

(I'll update the test to reflect the solution of this problem.)