docs: private static long addUnsignedReturnOverflow(Slice left, Slice right, Slice result, boolean resultNegative)
      {
          // TODO: consider two 7 bytes operations
          int l0 = getInt(left, 0);
          int l1 = getInt(left, 1);
          int l2 = getInt(left, 2);
          int l3 = getInt(left, 3);
  
          int r0 = getInt(right, 0);
          int r1 = getInt(right, 1);
          int r2 = getInt(right, 2);
          int r3 = getInt(right, 3);
  
          long intermediateResult;
          intermediateResult = (l0 & LONG_MASK) + (r0 & LONG_MASK);
  
          int z0 = (int) intermediateResult;
  
          intermediateResult = (l1 & LONG_MASK) + (r1 & LONG_MASK) + (intermediateResult >>> 32);
  
          int z1 = (int) intermediateResult;
  
          intermediateResult = (l2 & LONG_MASK) + (r2 & LONG_MASK) + (intermediateResult >>> 32);
  
          int z2 = (int) intermediateResult;
  
          intermediateResult = (l3 & LONG_MASK) + (r3 & LONG_MASK) + (intermediateResult >>> 32);
  
          int z3 = (int) intermediateResult & (~SIGN_INT_MASK);
  
          pack(result, z0, z1, z2, z3, resultNegative);
  
          return intermediateResult >> 31;
      }