While looking for things in core which might conceivably trigger the
Windows ctype assertion failure (haven't found any yet), I noticed
that help_dir() was still treating ^O as a wizard mode-only command.
Also, documentation about that command was never brought up to date.
I wish this change to ^O hadn't been done. #overview already has
a meta/alt M-O shortcut and overloading wizard mode commands makes
documentation more complicated since wizard mode stuff traditionally
has been left unmentioned.
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