readonly type: 'Unreachable' | 'SendFailure' | 'Filtered' | 'UnweighableMessage' | 'DestinationNotInvertible' | 'Empty' | 'CannotReanchor' | 'TooManyAssets' | 'InvalidOrigin' | 'BadVersion' | 'BadLocation' | 'NoSubscription' | 'AlreadySubscribed';