0.9.16.10:

	Massage the new ARRAY :SIMPLE-UNION2 type method into a little
	bit more of acceptability.
	... now (or simple-string simple-array) is the same as
		(or simple-array simple-string)
	... really quite complicated unions still seem to work, judging
		by ETYPECASE.15 and SUBTYPEP.OR.4
	... include some simple test cases.