** 'defvar-keymap' can specify hints for 'repeat-mode'.

[phikal]

This will probably need some separate support for both Emacs 29 and pre-29 releases. Or should we the prefixed definition just reduce to an un-prefixed defvar-keymap expression?

Using ':repeat (:hints ((command . "hint") ...))' will show
the hint string in the echo area together with repeatable keys.

[minad]

This sounds like a feature which we do not have to implement, since it is an acceptable downgrade of functionality if the hints are not shown?