fix: support macOS system Bash in installer - #302
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Summary
macOS ships Bash 3.2 as its system Bash. Because Bub’s public installer uses
#!/usr/bin/env bash, it should work with that default shell instead of requiring users to install a newer Bash before installing Bub.The installer currently fails on macOS when
set -uexpands an empty optional-dependency array, and later callsmapfile, which was introduced in Bash 4.mapfilewith a Bash 3.2-compatible line-reading loop