Inbox Behavior if Activity/Object is not supported?

I’m currently extending my blog software with an ActivityPub implementation (GitHub - H4kor/owl-blogs)
Currently it only supports a small set of activitys (follow/unfollow, like and announce).

Is there an expected behavior for the inbox route, when a sent activity/object is not supported by the implementation (which status code, response body) ?

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You can ignore unsupported activities. 200 or 202 is preferable, because 4** may trigger a retry

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