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POSIX.1-2024 has been published
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nushell scripts aren't shellscripts?
I usually write “POSIXy shell” but I thought that was clear from context this time.
The problem is that exit statuses !=0 aren't treated as error by default (with a way to turn that off for individual expressions). Instead you have to set multiple settings and avoid certain constructs in bash/ZSH/...
Everything that works like a modern programming language by default is fine of course