code: func (m *mruNonceMap) Delete(nonce uint64) {
  	m.mtx.Lock()
  	if node, exists := m.nonceMap[nonce]; exists {
  		m.nonceList.Remove(node)
  		delete(m.nonceMap, nonce)
  	}
  	m.mtx.Unlock()
  }
docs: // Delete deletes the passed nonce from the map (if it exists).
  //
  // This function is safe for concurrent access.