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0061dca950
The helper used ${var,,} (bash 4+ lowercase parameter expansion) and
[[ =~ ]], which fail on macOS default /bin/bash (3.2.57) with:
bash: ${default,,}: bad substitution
With 'set -e' at the top of the script, that aborts the whole
installer for macOS users who don't have a newer bash on PATH.
Replace the lowercase expansions with POSIX-style case patterns
(`[yY]|[yY][eE][sS]|...`) that behave identically and parse cleanly
on bash 3.2. Verified with a 15-case behavior test on both bash 3.2
and bash 5.2 — all pass.