.. efun:: int reverse(int arg)
  string  reverse(string arg)
  mixed * reverse(mixed * arg)
  mixed * reverse(mixed * & arg)

  Reverse the content of array or string :arg:`arg` and return the result. If :arg:`arg` is an integer, the bits in the integer are reversed.

  If called in the reference variant, the argument array itself is reversed and then returned.

  .. usage::

    ::

      reverse(0x306a) // returns 0x560c0000

      reverse("test") // returns "tset"

      mixed * arr = ({ 1, 2 });
      reverse(arr)  // returns ({ 2, 1 }), leaves arr unchanged.
      reverse(&arr) // returns ({ 2, 1 }), sets arr to ({ 2, 1 })

  .. limit:: Reference ranges like ``reverse(&(a[1..2]))`` are not supported.

  :history 3.3.529 introduced:
  :history 3.3.532 changed: added the reversal of bits in an integer.

  .. todo:: should blank seealso below be an error?

  .. seealso::