releaseAll method

void releaseAll()

Frees every active id, keeping the lastIssuedId cursor.

What a transport wants at close: the ids are no longer in use, but the sequence they came from is exactly what a reconnecting wrapper needs afterwards, and a transport that closes itself -- how every peer-started drop is reported -- does so before anything above can read it.

Implementation

void releaseAll() {
  _activeIds.clear();
}