Subject: bug#70139: [PATCH] Improve key-translate to support removing translations

From: Stefan Monnier <[email-masked]>
Date: Tue, 09 Apr 2024 08:57:13 -0400

> -            (lambda (form) (keymap--compile-check from to) form)))
> +            (lambda (form) (keymap--compile-check from (if to to nil)) form)))
                                                          ^^^^^^^^^^^^^^

??

Just like (and to to), this is just a complicated way to say `to`.
What is the underlying idea?

        Stefan