rtupLookupDefault ::
       RDataType     -- ^ Default value to return in the case the column name does not exist in the RTuple
    -> ColumnName    -- ^ ColumnName key
    -> RTuple        -- ^ Input RTuple
    -> RDataType     -- ^ Output value
rtupLookupDefault =  HM.lookupDefault
rtupLookupDefault ::
       RDataType     -- ^ Default value to return in the case the column name does not exist in the RTuple
    -> ColumnName    -- ^ ColumnName key
    -> RTuple        -- ^ Input RTuple
    -> RDataType
rtupLookupDefault =  HM.lookupDefault
rtupLookupDefault =  HM.lookupDefault