Michael Heerdegen <michael_heerdegen@web.de> writes:

> Actually, it's not even trivial at all.  Setting alist-get as place
> could also build a new alist, leaving the one stored in the ALIST place
> intact, and set place ALIST to the new list.  But it potentially
> modifies the list stored in place ALIST.  That's not inevitable, so it
> could be worth telling that.

I tried that - see the draft at the end of the message.  And I tried to
cover everything that has been noted here to some degree while still
keeping the docstring fluent and at an acceptable length.

I did not touch the manual, maybe someone else wants to give that a try?