Is self a valid Base64 character ?

Property definitions

base64 :: base64 $ Char :: is_base64_char
	# Is `self` a valid Base64 character ?
	fun is_base64_char: Bool do
		if code_point >= 127 then return false
		return code_point.is_base64_char
	end
lib/base64/base64.nit:21,2--25,4