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From: Richard Stallman <rms@gnu.org>
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    > So it's basically equivalent to 
    > 
    > (defun mini-menu (menu)
    >   (message (mapconcat #'cadr menu "  "))
    >   (call-interactively (or (nth 2 (assoc (read-char) menu)) 
    >                           (error "Unknown key"))))

    Essentially, yes.  There are a few more twists to it, but you got
    the essentials right!

Are you saying that this new feature is implemented using the
HierarKey menu feature, as above?  That is good.

    However, I was advocating for adding a very simple way for packages
    to query the user for "trivial" selections as an alternative to
    using keymaps and adding prompting at the same time...

Could you send me the actual code?