# Treat a newline in string as dividing string into multiple lines
	#
	# So that `$` can match before the newline and `^` can match after.
	# Also, don’t permit `.` to match a newline, and don’t permit `[^…]` to match a newline.
	#
	# Otherwise, newline acts like any other ordinary character.
	var newline = false is writable