I updated the server software to use FEP-5711, the inverse properties FEP. It is a way to declare two-way relations; if X has an `inbox` property with value Y, then Y has an `inboxOf` property with value X. It helps with navigation when you're using the ActivityPub API, and it also helps with spoofing (since both objects agree on the relationship).

w3id.org/fep/5711

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