docs: private long getHashPositionOfElement(Block block, int position)
      {
          checkArgument(!block.isNull(position), "position is null");
          int length = block.getSliceLength(position);
          long hashPosition = getMaskedHash(block.hash(position, 0, length));
          while (true) {
              int blockPosition = blockPositionByHash.get(hashPosition);
              if (blockPosition == EMPTY_SLOT) {
                  // Doesn't have this element
                  return hashPosition;
              }
              else if (elementBlock.getSliceLength(blockPosition) == length && block.equals(position, 0, elementBlock, blockPosition, 0, length)) {
                  // Already has this element
                  return hashPosition;
              }
  
              hashPosition = getMaskedHash(hashPosition + 1);
          }
      }