bug#59305: 29.0.50; keymap-global-set handling of string bindings different from global-set-key

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

>     Stefan> `key-parse` always returns a vector.
> You want us to recommend this?
> (keymap-global-set "C-a" (key-parse "hello"))

Sorry, I was not thinking right.  The function you'd need to use to
convert "hello" into the proper form for `keymap-global-set` is either:

- `key-description`: does the "reverse" of `kbd` and `key-parse`.
- `kmacro--to-vector`: turns an old-style string of events to a vector
  of events.

> so Iʼd still worry about future regressions caused by `key-parse'
> being changed to enforce `key-valid-p'

Indeed.  Not only that, but it'll mis-interpret `C-a` to mean a single
event instead of 3 events.


        Stefan