works fine:
(rnd-replace '(123) '(1 2 3 4))
=> (1 2 3 123)
don't work ... why?
(rnd-replace '(123) '(1 2 3 4) :exclude '(2 3))
=>
> Error: The value 1 is not of the expected type list.
> While executing: pos-rep, in process Listener-1(6).
> Type cmd-. to abort, cmd-\ for a list of available restarts.
> Type :? for other options.