code: func (s *PublicBlockChainAPI) GetUncleCountByBlockNumber(ctx context.Context, blockNr rpc.BlockNumber) *hexutil.Uint {
  	if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
  		n := hexutil.Uint(len(block.Uncles()))
  		return &n
  	}
  	return nil
  }
docs: // GetUncleCountByBlockNumber returns number of uncles in the block for the given block number