version 1 .
embeddedType sturdy.WireRef .

Assertion = any .
Handle    = int .
Event     = Assert / Retract / Message / Sync .
Oid       = int .
Turn      = [TurnEvent ...].
TurnEvent = [@oid Oid @event Event].

Assert = <assert @assertion Assertion @handle Handle>.
Retract = <retract @handle Handle>.
Message = <message @body Assertion>.
Sync = <sync @peer #!#t>.
