-- | Is the given row identifier invalid? I.e. is it guaranteed to not match any
--   row in any table?
isInvalidRowId :: RowID -> Bool
isInvalidRowId (RowID n) = n < 0
isInvalidRowId :: RowID -> Bool
isInvalidRowId (RowID n) = n < 0
isInvalidRowId (RowID n) = n < 0