-- | A 'RefGroup' is considered to refer exactly to its indices if it
--   has no bounds information or examples associated with it.
isExact :: RefGroup -> Bool
isExact rg = rgBounds rg == emptyBounds
isExact :: RefGroup -> Bool
isExact rg = rgBounds rg == emptyBounds
isExact rg = rgBounds rg == emptyBounds