code: func (ec *Client) TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error) {
  	var num hexutil.Uint
  	err := ec.c.CallContext(ctx, &num, "eth_getBlockTransactionCountByHash", blockHash)
  	return uint(num), err
  }
docs: // TransactionCount returns the total number of transactions in the given block.