/usr/lib/cruft/explain/zsh is in cruft-common 0.9.34.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/dash
set -e
if [ ! -e /usr/share/zsh ]; then exit 1; fi
find /usr/share/zsh -type f -name \*.zwc
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