dcf pointed out in [this comment](https://trac.torproject.org/projects/tor/ticket/10559#comment:1) on legacy/trac#10559 that `pt-spec.txt` claims that little-t tor's parsing of `Bridge` lines was extended to support `keyid=fingerprint` (where `fingerprint` is the digest of the bridge's ID key). Little-t tor does not support this `keyid=` prefix. I've tested it; see [comment 3](https://trac.torproject.org/projects/tor/ticket/9499#comment:3) and [comment 4](https://trac.torproject.org/projects/tor/ticket/9499#comment:4) on legacy/trac#9449. Since it wasn't ever implemented, the `keyid=` prefix to bridge fingerprints should be removed from `pt-spec.txt` [L27](https://gitweb.torproject.org/torspec.git/blob/782dacf43035892a0025b252f99018a6a1082b0e:/pt-spec.txt#l27).