Stable is a problem because a lot of these shells don’t offer any guarantees for breaking changes. My own shell, https://github.com/lmorg/murex https://github.

Stable is a problem because a lot of these shells don’t offer any guarantees for breaking changes. My own shell, https://github.com/lmorg/murex https://github.com/lmorg/murex is committed to backwards compatibility but even here, there are occasional changes made that might break backwards compatibility. Though I do push back on such changes as much as possible, to the extent that most of my scripts from 5 years ago still run unmodified. In fact I’ve started using some of those older scripts as part of the automated test suits to check against accidental breaking changes.