Validate prerelease suffix as a whole, not by parts

I have this template for prerelease suffix:

echo $GSG_PRE_TMPL
{{ (env "CI_COMMIT_REF_SLUG") }}, {{ (env "CI_COMMIT_SHORT_SHA") }}

These variables correspond to branch name and short commit hash. Example version generated by GSG: 1.0.0-branch_name.12ab34cd

Now if commit hash contains only decimal digits AND starts with zero, eg 01234567, i get this error:

Creating new tag for release...
2022/06/30 01:45:30 pre version tmpl: Numeric PreRelease version must not contain leading zeroes "01234567"

I am aware of this semver rule not to start prerelease version, if it's decimal, from zero. OK, but i already include branch name before the hash! branch_name.01234567

So it is perfectly valid. GSG should not validate each separate template part for prerelease, it should validate whole result instead (the one joined by .)

By the way, chances of getting this error are 2 in a billion, still i got it...