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When I came across this tool, I wondered if it worked for bourne shell. I assumed it would, because you mention POSIX, and I've read a bunch of your blog posts. Still, I wasn't sure since it wasn't explicit.
Perhaps you think it's obvious and doesn't need stating, but I thought it is worthwhile to explicitly state bourne shell and run CI against it.
One question: is
/bin/sh
on ubuntu actually bourne shell, or is it something else?