Since [the podcast namespace](https://podcastnamespace.org/) now supports [GUIDs](https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/1.0.md#guid), I've been embedding the GUIDs in [the `TGID` (`PODCASTID`) ID3 tag field](https://docs.mp3tag.de/mapping/#podcastid). Please consider adding support for this field!