There's a merged pull request on the void-packages repository

hooks/pre-pkg/03-rewrite-python-shebang.sh: use grep -r instead of find.
https://github.com/void-linux/void-packages/pull/28276

Description:
This saves us one sed execution per file in the destdir, resulting
in a major speedup.

Grep will only consider text files and only look at the first line.