Re: The different results obtained by apply function.

[Emanuel Berg]

> You can get this effect without `apply' with `cl-mapcar',
> and the usual `mapcar' behavior without cl-mapcar:
>
>   (cl-mapcar #'list       '(1 2) '(3 4))  ; ( (1 3)   (2 4))
>   (cl-mapcar #'list (list '(1 2) '(3 4))) ; (((1 2)) ((3 4)))
>      (mapcar #'list (list '(1 2) '(3 4))) ; (((1 2)) ((3 4)))

While it is easy to say `cl-mapcar' is much cooler with the
aggregate function over multiple sets ... but observe

  (cl-mapcar #'list '(1 2) '(3 4))   ; ((1 3) (2 4))
  (cl-mapcar #'list '(1 2) '(3 4 5)) ; ((1 3) (2 4))

so same outdata for different indata - non-injective!

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