UTF-8, ASCII excluded

ARGUMENT
	CESU
		DESC	Decode surrogate pairs
	LOOSE
		DESC	Accept undecoded surrogates
	NUL
		DESC	Accept NUL character, must used with OVERLONG, since ASCII is excluded, so they must be overlong
	OVERLONG
		DESC	Accept overlong sequence
	SUPER
		DESC	Accept code point over U+10FFFF
