FieldInfo.SetValue(object, object), but that requires an object as a first param. So we generated code responsible for casting it back to object (but only for readonly fields). So struct created using activator → casted to its type → casted back to object, was causing an error.
existenceConfirmedis true when terminated message was send directly by the terminated actor.
addressTerminatedis true when you were watching a remote actor on a cluster node, that has been marked as unreachable. So Actor itself may or may not be dead, but we cannot tell it for sure and we cannot communicate with it
1<Wire.Surrogate>, Boolean, System.Collections.Generic.IEnumerable1<Wire.Converters.ValueSerializerFactory>)'.