`Info::infohash` will discard fields not present in the `Info` struct,
and can thus produce an erronous infohash.
To try to prevent this function from being called in those
circumstances, rename it to `Info::infohash_lossy`, and add a comment
explaining why it is dangerous.
Embarassingly, `Info::infohash` was called in
`TorrentSummary::from_input`, and thus transitively by the torrent show
subcommand, where it is definitely not safe, since torrent show is
intended to be used with arbitrary torrents. This is now fixed.
There was also a build failure caused by a cache issue, so change the
cache keys to invalidate the caches.
type: fixed
7ca9ed62d5