The list of arbiters currently active between int1 and int2.
For ONGOING callbacks, arbiters are valid for the entire step.
For BEGIN/END callbacks, the list reflects the state at the moment
the event fired.
The event type that caused this callback to fire (e.g., CbEvent.BEGIN).
The first interactor involved in the interaction.
The second interactor involved in the interaction.
The listener that this callback was fired from.
Callback object passed to InteractionListener handlers.
Provides both interactors and the list of active arbiters between them. Do not store this object beyond the handler scope — it is pooled and reused.
Converted from nape-compiled.js lines 1398–1445.