Bridgy Fed `repost-of`s being mis-categorised as a `mention-of`

[jamietanna]

I've noticed a few reposts that are appearing incorrectly in Webmention.io:

```json { "source": "https://ap.brid.gy/convert/web/https:/mastodon.nl/users/ericdere/statuses/111159206972088337/activity", "verified": true, "verified_date": "2023-10-01T10:08:18+00:00", "id": 1722182, "private": false, "data": { "author": { "name": "Eric de Redelijkheid :fedi:", "url": "https://mastodon.nl/@ericdere", "photo": "https://webmention.io/avatar/mastodon.nl/b4f276c7bd07cf061b9e4cdb44c91a674cfa8b0b87f62fdfbd0033ec1f49efef.jpg" }, "url": "https://ap.brid.gy/convert/web/https:/mastodon.nl/users/ericdere/statuses/111159206972088337/activity", "name": null, "content": "shared this.", "published": "2023-10-01T10:08:11+00:00", "published_ts": null }, "activity": { "type": null }, "target": "https://www.jvt.me/posts/2023/09/30/tweetus-deletus/" }, ```

However, when looking up the Bridgy Fed URL https://php.microformats.io/?url=https://ap.brid.gy/convert/web/https:/mastodon.nl/users/ericdere/statuses/111159206972088337/activity:

```json { "items": [ { "type": [ "h-entry" ], "properties": { "uid": [ "https://mastodon.nl/users/ericdere/statuses/111159206972088337/activity" ], "name": [ "shared this." ], "repost-of": [ "https://www.jvt.me/posts/2023/09/30/tweetus-deletus/" ], "published": [ "2023-10-01T10:08:11+00:00" ], "content": [ { "html": "shared this.", "value": "shared this." } ], "author": [ { "type": [ "h-card" ], "properties": { "uid": [ "https://mastodon.nl/users/ericdere" ], "name": [ "Eric de Redelijkheid :fedi:" ], "nickname": [ "ericdere" ], "url": [ "https://mastodon.nl/@ericdere" ], "photo": [ { "value": "https://mastodon.nl/system/accounts/avatars/109/371/631/528/265/180/original/2083842287fc1e33.jpeg", "alt": "" }, { "value": "https://mastodon.nl/system/accounts/headers/109/371/631/528/265/180/original/5fd07b05a3306a82.jpg", "alt": "" } ] }, "value": "Eric de Redelijkheid :fedi:" } ] } } ], "rels": {}, "rel-urls": {}, "debug": { "package": "https://packagist.org/packages/mf2/mf2", "source": "https://github.com/indieweb/php-mf2", "version": "v0.5.0", "note": [ "This output was generated from the php-mf2 library available at https://github.com/indieweb/php-mf2", "Please file any issues with the parser at https://github.com/indieweb/php-mf2/issues", "Using the Masterminds HTML5 parser" ] } } ```