My gripe is about being able to work on a bash script that needs to work "everywhere". Bash 4 was release over a decade ago, so it's a reasonable expectation that it will be present on most servers with a shell.
Homebrew works around that, but their refusal over GPL taint for having the binary present still doesn't seem right.
That may cause errors or undesirable behaviour. As way of example, dealing with arrays: `read -a` in bash is `read -A` in zsh, and the former’s arrays are zero-based while the latter’s are one-based.
