Mastodon API: conversation object has wrong type for id

[VyrCossont]

The output of the conversations API method is an array of Conversation objects. These are meant to have an id field with a string value, but Pixelfed's implementation returns a number instead. Pixelfed should convert that number to a string when serializing a Conversation, consistent with the way IDs are handled in the Mastodon API generally.

Actual output:

[
  {
    "id": 279,
    "unread": false,
    "accounts": [
      {
        "id": "602164231157803040",
        "username": "vyr",
        "acct": "vyr@demon.social",
        "…": "…"
      }
    ]
  }
]

Corrected output:

[
  {
    "id": "279",
    "unread": false,
    "accounts": [
      {
        "id": "602164231157803040",
        "username": "vyr",
        "acct": "vyr@demon.social",
        "…": "…"
      }
    ]
  }
]