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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: cl-macs: case with a nil value
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Glenn Morris <gmorris+news@ast.cam.ac.uk> writes:

> (case nil
>   (nil "nil")
>   (t "t"))
>
> -> "t"
>
> (case nil
>   ((nil) "nil")
>   (t "t"))
>
> -> "nil"
>
> Does that seem weird to anyone else?

Not to me.  It works as advertised in <info://cl/Conditionals>