For some reason, pressing A-m (i.e. typing m while holding the Alt modifier key) inserts the μ character. I want to remove this binding so that I can then bind this key sequence to some interactive command. Unfortunately, (global-unset-key (kbd "A-m")) does not accomplish this, and neither does (global-set-key (kbd "A-m") nil).
With emacs-mac, I was still able to bind that key sequence to a command by doing something like (global-set-key (kbd "μ") 'mu4e), but this doesn't work with emacs-plus.
(To avoid confusion, I am referring to the Alt rather than the Meta modifier. The latter is often bound to the Alt key and sometimes incorrectly referred to as "Alt".)