NAME
	m_set_default - set the default value of a mapping

SYNTAX
	mapping m_set_default(mapping map,mixed def);

DESCRIPTION
	Set the value that is returned when you index a mapping on
	an index that isn't present in the mapping.

BUGS
	The default value of the mapping is not saved by save_object or
	code_value.

SEE ALSO
	m_get_default
