Representing key sequences (was: master 859190f 2/3: Convert some keymaps to defvar-keymap)

[Stefan Monnier]

Currently, we have 2 "builtin/native" representation of key sequences:

(A) strings (where every char represents an event)
(B) vectors of events

I believe they are both unpopular, but (A) really sucks (it only
handles a small subset of possible key-sequences).

There are two "standard" alternatives:
(C) string (passed to `kbd`).
(D) vectors of lists (using the XEmacs syntax).

I'd be in favor of promoting both (C) and (D) while phasing out both (A)
and (B).


        Stefan