.. efun:: int objectp(mixed arg)

  Return 1 if arg is an object.

  .. seealso:: :efun:`clonep`, :efun:`closurep`, :efun:`floatp`, :efun:`mappingp`, :efun:`intp`, :efun:`referencep`, :efun:`pointerp`, :efun:`stringp`, :efun:`symbolp`, :efun:`structp`