Announcing the submission of one of my oldest fediverse enhancement
proposals to the Codeberg FEP official repository[1].

As mentioned the services making use of the GoActivityPub library
already support this FEP. Here are some examples:

 * User discovery based on preferredUsername in the /actors collection:

https://federated.id/actors?maxItems=100&name=marius

 * User discovery based on preferredUsername as /inbox Create object:

https://federated.id/inbox?maxItems=100&type=Create&object.name=marius

 * Page objects containing ActivityPub in title as inbox Create object:

https://federated.id/inbox?maxItems=100&type=Create&object.type=Page&object.name=~ActivityPub

Please reply to this message with any feedback.

/marius

[1] https://codeberg.org/fediverse/fep/pulls/452