Re: read-from-minibuffer and friends.

[Richard Stallman]

INITIAL is not quite deprecated.  It is still used by a few things
and we don't plan to change them.

I think ideally all these functions should handle INITIAL
in the same way.  If it is easy to do that, please do it.
I would guess the best way is to move the handling of INITIAL
from Fread_from_minibuffer into read_minibuf.

But that's not worth a lot of work.  If that turns out to have snags,
then the fallback is to document the current behavior.