KT, A> mixin
Alt type class identifies an associative operation on a type constructor.
HKT< KT, A> orElse()) → HKT< KT, A>
B>( B f(A a)) → HKT< KT, B>
Return type is
HKT<G, B>, which expresses the fact that what we return is using exactly the same type constructor represented by the brand
Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
) → String
A string representation of this object.