Function content_hash 

pub fn content_hash(text: &str) -> String

A stable sentinel over an arbitrary generated text artefact.

Used for playlists, whose .m3u8 body is generated rather than fetched: the hash is taken over the full rendered text, so the playlist name, the member order, and every member’s relative path, title, and duration all feed it, and any change that reaches the file triggers a rewrite. The render is deterministic, so the hash is stable across runs and platforms.