- test them in `brew test-bot` (before we do so in homebrew/core)
- don't fail if we cannot find the tab/install receipt in a bottle
- cache listing the files in a bottle so we don't do it more times than
  necessary
- fix resolution of version and formula names from a bottle if we're
  getting them from a bottle without a tab/install receipt

This will need to be in a tagged release before we can ship tab-less
bottles to users.