úέ#NoneA Type synonym for a  . /A basic object type that can contain values of  different types.  an empty  . empty Object []Given a key type, create a   labeled by the key.  Here'2s an example of creating a price tag for objects. ,data Price = Price deriving (Show, Typeable)9instance KeyType Price where type ValType Price = Integer2let price :: Member Price; price = mkMember Price;"let x = set price (Just 120) emptyview price emptyNothing view price xJust 120 Create a   with a default value.  Here'.s a price tag for objects with default value. ,data Price = Price deriving (Show, Typeable)9instance KeyType Price where type ValType Price = Integer<let price :: Member Price; price = mkMemberWithDef Price 10;"let x = set price (Just 120) emptyview price emptyJust 10 view price xJust 120   None    dynamic-object-0.1.0.1Data.Object.Dynamic.TypesData.Object.DynamicMemberKeyTypeValTypeObjectemptymkMembermkMemberWithDef lens-3.7.1.2Control.Lens.TypeLens $fShowObject