# Utility for `BinaryWriter`
	private fun int64_byte_at(index: Int, big_endian: Bool): Int `{
		union {
			unsigned char bytes[8];
			int64_t val;
			uint64_t conv;
		} u;

		u.val = self;

		if (big_endian)
			u.conv = htobe64(u.conv);
		else u.conv = htole64(u.conv);

		return u.bytes[index];
	`}