merge2<R, V1, V2> method
Same as merge, but with 2 arguments.
Implementation
@override
Maybe<R> merge2<R, V1, V2>(
Maybe<V1> v1, Maybe<V2> v2, Merger2<R, T, V1, V2> merger) =>
flatMap((a) => v1.flatMap((b) => v2.map((c) => merger(a, b, c))));