stashState method
Copies one sequence's KV state into a native, in-memory stash under
key — the fast path for swapping conversations: no disk write and
no bytes crossing the platform channel.
Resolves to the stash's token and byte counts; (0, 0) when the
sequence held nothing reusable (nothing is stashed). The stash lives
and dies with the session. An existing entry under key is replaced.
Implementation
Future<({int tokens, int bytes})> stashState(
String key, {
int sequenceId = 0,
}) => _isolate.stashState(id, sequenceId, key);