A pit answers to the id the game publishes and to its slug, and a name is
slugged before it is tried, so /arenas/greenhorn-arena and
/arenas/Greenhorn Pit are the same pit. The id wins where the two collide.

Both handles carry their weight on this track rather than one being a courtesy:
every one of the six keys ends -arena and every one of the six names ends
Pit, so the slug is never the key.

The ladder and the winner's table are here unasked, where the listing hides them
behind ?include=: one pit is what the client's own detail pane is, and a pane
that answers what waits on the sand only when asked twice is not answering.