Github user bodewig commented on the issue:
https://github.com/apache/commons-compress/pull/70
Many thanks. I agree this is cleaner, the existing method is a leftover of
the time before we made Java7 our baseline.
While I don't think we consider the tests a public API of ours, the change
would be smaller and keep perfect backwards compatibility if you "just" changed
the implementation of `mkdir`.---
