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Re:Fish: A command line shell for the 90s by akx on Saturday October 26, 2019 @03:09AM (#21362213)
Those are probably bugs you could report to the project.
Re:Fish: A command line shell for the 90s by kick on Saturday October 26, 2019 @03:25AM (#21362267)
They're intentional.

They have considered a compatibility layer in the past:

https://github.com/fish-shell/fish-shell/wiki/POSIX-compatib...