Adding an entry checked `HasPath` on every prefix of its path, so a name with thousands of
components did O(depth^2) hashing per entry before anything was charged.
- entry names over 256 path components are refused and reported like other unsafe names
- implied parent directories are found walking from the deepest parent up, stopping at the first
one that already exists
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Alex Goodman
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