Sourcery-bot housekeeping note on PR #11: REPO_ROOT was only mentioned
in comments after the cwd-resolution fix in 61005655 and was no longer
used by any logic in this module (other math-first scripts have their
own REPO_ROOT constants). Removed it. Folded the rationale that
previously lived in the comment above the constant into the
_git_toplevel docstring so future readers still see why we don't
hardcode the cwd.
Co-Authored-By: Allaun Silverfox <bigdataiscoming+9i37y6j2@protonmail.com>
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