Bug: Crash on Returning Rows Without Closing ResultSet

When returning rows without closing the result set that the rows came from, a crash occurs.

`mux.requestConnection().then(conn) => {
  return conn.execute(query).then((results) => {
    const rows = results?.getRows().then(r) => {
      return results?.close().then(() => r); // without this line a crash occurs
    })
    return rows
  })
})`