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    I added this answer because none of the other (excellent) answers mention Dash. It's only mentioned in the question comments but users (including those who find this question via a search engine) shouldn't have to check through comments to see all the valid answers. Commented Jul 19, 2021 at 17:10
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    The design of dash priortizes practicality over strict conformance. I would not trust it to identify all deviations from POSIX the way posh specifically does. Commented Apr 15, 2022 at 8:34