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Add new primary identifier; actor objet

given: "Alice" created an actor on "abel" called "Alice"

send.Alice.request.create_actor
{
  "base_url": "http://abel",
  "preferred_username": "Alice",
  "profile": {},
  "automatically_accept_followers": null,
  "name": null
}
receive.Alice.response.create_actor
{
  "attachment": null,
  "published": "2025-12-19T09:49:28.481217",
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    {
      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers"
    }
  ],
  "publicKey": {
    "id": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA#legacy-key-1",
    "owner": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
    "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzVjCEB6AdpmMnR5Uv7C5\nX9nTSYg2eaYO+WXgjKJuLklcA8JUA/lenRDncX3AZWgp4tULgrDALxcIb8GjsT+s\nPI3Lcg+4QDCwm0RlyAnASqjrFtOGfkjZfTbcm4IaxohVF001dUrJiEEtrLDOQZCB\n8Iq4yqVmTRMUucIdWLwwOS4Dq+LMCI26CPQ+K0n3GzgfozcElnnp9HmUidZb7OHd\n7EU30Zh7oudzZPagNKf28VLyr0VWMX3UfQgKoEnXrMd4vnuqQ+hoay961Kzr4hZ3\nfZrihIadIZpaHJMcSam3OwV0cWV+OxyzZlkGAeYI6QclRd1KEV5ICgvl4N0UsoWr\nfQIDAQAB\n-----END PUBLIC KEY-----\n"
  },
  "id": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
  "type": "Person",
  "inbox": "http://abel/inbox/MYGt4FvBmWlxgxmQj29QAw",
  "outbox": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/outbox",
  "followers": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/followers",
  "following": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/following",
  "preferredUsername": "Alice",
  "name": "Alice",
  "identifiers": [
    "acct:Alice@abel",
    "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA"
  ],
  "endpoints": {
    "sharedInbox": "http://abel/shared_inbox"
  },
  "manuallyApprovesFollowers": true
}

given: "Alice" adds "acct:alex@abel" as a primary identifier

send.Alice.trigger.update_actor
{
  "actor": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
  "profile": null,
  "autoFollow": null,
  "actions": [
    {
      "action": "create_identifier",
      "identifier": "acct:alex@abel",
      "primary": true
    }
  ]
}
receive.Alice.outgoing.Update
{
  "data": {
    "raw": {
      "@context": "https://www.w3.org/ns/activitystreams",
      "type": "Update",
      "actor": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
      "to": [
        "https://www.w3.org/ns/activitystreams#Public"
      ],
      "cc": [
        "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/followers"
      ],
      "published": "2025-12-19T09:49:28Z",
      "object": {
        "attachment": null,
        "published": "2025-12-19T09:49:28.481217",
        "@context": [
          "https://www.w3.org/ns/activitystreams",
          "https://w3id.org/security/v1",
          {
            "manuallyApprovesFollowers": "as:manuallyApprovesFollowers"
          }
        ],
        "publicKey": {
          "id": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA#legacy-key-1",
          "owner": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
          "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzVjCEB6AdpmMnR5Uv7C5\nX9nTSYg2eaYO+WXgjKJuLklcA8JUA/lenRDncX3AZWgp4tULgrDALxcIb8GjsT+s\nPI3Lcg+4QDCwm0RlyAnASqjrFtOGfkjZfTbcm4IaxohVF001dUrJiEEtrLDOQZCB\n8Iq4yqVmTRMUucIdWLwwOS4Dq+LMCI26CPQ+K0n3GzgfozcElnnp9HmUidZb7OHd\n7EU30Zh7oudzZPagNKf28VLyr0VWMX3UfQgKoEnXrMd4vnuqQ+hoay961Kzr4hZ3\nfZrihIadIZpaHJMcSam3OwV0cWV+OxyzZlkGAeYI6QclRd1KEV5ICgvl4N0UsoWr\nfQIDAQAB\n-----END PUBLIC KEY-----\n"
        },
        "id": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
        "type": "Person",
        "inbox": "http://abel/inbox/MYGt4FvBmWlxgxmQj29QAw",
        "outbox": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/outbox",
        "followers": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/followers",
        "following": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/following",
        "preferredUsername": "alex",
        "name": "alex",
        "identifiers": [
          "acct:alex@abel",
          "acct:Alice@abel",
          "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA"
        ],
        "endpoints": {
          "sharedInbox": "http://abel/shared_inbox"
        },
        "manuallyApprovesFollowers": true
      },
      "id": "http://abel/object/019b3603-ab35-7f86-899c-3e9beca5cbba"
    }
  },
  "actor": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
  "event_type": "outgoing",
  "history_id": null
}

when: "Alice" retrieves the object with id "acct:alex@abel"

send.Alice.request.fetch
{
  "actor": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
  "uri": "acct:alex@abel"
}
receive.Alice.response.fetch
{
  "actor": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
  "uri": "acct:alex@abel",
  "data": {
    "attachment": null,
    "published": "2025-12-19T09:49:28.481217",
    "@context": [
      "https://www.w3.org/ns/activitystreams",
      "https://w3id.org/security/v1",
      {
        "manuallyApprovesFollowers": "as:manuallyApprovesFollowers"
      }
    ],
    "publicKey": {
      "id": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA#legacy-key-1",
      "owner": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
      "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzVjCEB6AdpmMnR5Uv7C5\nX9nTSYg2eaYO+WXgjKJuLklcA8JUA/lenRDncX3AZWgp4tULgrDALxcIb8GjsT+s\nPI3Lcg+4QDCwm0RlyAnASqjrFtOGfkjZfTbcm4IaxohVF001dUrJiEEtrLDOQZCB\n8Iq4yqVmTRMUucIdWLwwOS4Dq+LMCI26CPQ+K0n3GzgfozcElnnp9HmUidZb7OHd\n7EU30Zh7oudzZPagNKf28VLyr0VWMX3UfQgKoEnXrMd4vnuqQ+hoay961Kzr4hZ3\nfZrihIadIZpaHJMcSam3OwV0cWV+OxyzZlkGAeYI6QclRd1KEV5ICgvl4N0UsoWr\nfQIDAQAB\n-----END PUBLIC KEY-----\n"
    },
    "id": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA",
    "type": "Person",
    "inbox": "http://abel/inbox/MYGt4FvBmWlxgxmQj29QAw",
    "outbox": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/outbox",
    "followers": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/followers",
    "following": "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA/following",
    "preferredUsername": "alex",
    "name": "alex",
    "identifiers": [
      "acct:alex@abel",
      "acct:Alice@abel",
      "http://abel/actor/8RTwIUuK1ZcbIqulWMnvKA"
    ],
    "endpoints": {
      "sharedInbox": "http://abel/shared_inbox"
    },
    "manuallyApprovesFollowers": true
  }
}

then: The preferred username is "alex"

then: "acct:alex@abel" is contained in the identifiers array