# MD5 digest of `self`
	#
	# ~~~
	# assert "".md5 == "d41d8cd98f00b204e9800998ecf8427e"
	# assert "a".md5 == "0cc175b9c0f1b6a831c399e269772661"
	# assert "abc".md5 == "900150983cd24fb0d6963f7d28e17f72"
	# ~~~
	fun md5: String do return to_cstring.native_md5.to_s