code: public static long hash64(long value)
      {
          long h2 = DEFAULT_SEED ^ SizeOf.SIZE_OF_LONG;
          long h1 = h2 + (h2 ^ (Long.rotateLeft(value * C1, 31) * C2));
  
          return mix64(h1) + mix64(h1 + h2);
      }
docs: Special-purpose version for hashing a single long value. Value is treated as little-endian