.. efun:: int mappingp(mixed arg)

  Returns 1 if the argument is a mapping, or 0 if it is not.

  .. seealso:: :efun:`mkmapping`, :efun:`m_indices`, :efun:`m_values`, :efun:`m_add`, :efun:`m_delete`, :efun:`sizeof`, :efun:`widthof`. :efun:`clonep`, :efun:`closurep`, :efun:`floatp`, :efun:`objectp`, :efun:`intp`, :efun:`referencep`, :efun:`pointerp`, :efun:`stringp`, :efun:`symbolp`, :efun:`structp`