# Return a `Bytes` instance where Nit escape sequences are transformed.
	#
	#     assert "B\\n\\x41\\u0103D3".unescape_to_bytes.hexdigest == "420A41F0908F93"
	#
	# `Bytes::chexdigest` is a loosely reverse methods since its result is only made
	# of `"\x??"` escape sequences.
	#
	#     assert "\\x41\\x42\\x43".unescape_to_bytes.chexdigest == "\\x41\\x42\\x43"
	#     assert "B\\n\\x41\\u0103D3".unescape_to_bytes.chexdigest == "\\x42\\x0A\\x41\\xF0\\x90\\x8F\\x93"
	fun unescape_to_bytes: Bytes do
		var res = new Bytes.with_capacity(self.byte_length)
		var was_slash = false
		var i = 0
		while i < length do
			var c = self[i]
			if not was_slash then
				if c == '\\' then
					was_slash = true
				else
					res.add_char(c)
				end
				i += 1
				continue
			end
			was_slash = false
			if c == 'n' then
				res.add_char('\n')
			else if c == 'r' then
				res.add_char('\r')
			else if c == 't' then
				res.add_char('\t')
			else if c == '0' then
				res.add_char('\0')
			else if c == 'x' or c == 'X' then
				var hx = substring(i + 1, 2)
				if hx.is_hex then
					res.add hx.to_hex
				else
					res.add_char(c)
				end
				i += 2
			else if c == 'u' or c == 'U' then
				var hx = substring(i + 1, 6)
				if hx.is_hex then
					res.add_char(hx.to_hex.code_point)
				else
					res.add_char(c)
				end
				i += 6
			else
				res.add_char(c)
			end
			i += 1
		end
		return res
	end