Subject: bug#65756: 30.0.50; ido-completion-buffer type doesn't allow nil as value

From: Mauro Aranda <[email-masked]>
Date: Tue, 5 Sep 2023 08:17:51 -0300

The docstring of ido-completion-buffer says:
"Set to nil to disable completion buffers popping up."

But the :type doesn't allow nil as value.