[BUG] org-mode binds C-c C-TAB, which seems illegal [9.5 (9.5-g0a86ad @ /home/il/.config/emacs/elpa/org-9.5/)]

[Ingo Lohmar]

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In 9.5, org-key-map binds org-force-cycle-archived to (kbd "C-c C-TAB").
At least on my machine, this specification is illegal: it generates an
entry in org-key-map, but the key presses yield an "undefined" message.

Binding the command to (kbd "C-c C-<tab>") instead works, but not on a
tty.

It's been my understanding that "TAB" is the ascii control character,
identical to C-i, and hence "C-TAB" cannot work.  "<tab>" is the GUI
system's key event (in my case, X), and does not work on a terminal.

Emacs  : GNU Emacs 28.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, 
cairo version 1.16.0)
 of 2021-09-02
Package: Org mode version 9.5 (9.5-g0a86ad @ 
/home/il/.config/emacs/elpa/org-9.5/)