OriginalRepresentable

The original object.

In case if the reactionable object has a referance to the original reactionable object, then it should be redefined here.

For example: Reposted activity should have a reference to the original activity and all reactions of a reposted activity should referenced to the original activity reactions. Usually the original activity should be stored in the activity object property as an enum and in this case the origin property could be redefined in this way:

public var original: Activity {
    if case .repost(let original) = object {
        return original
    }

    return self
}