add safeAsX(): Optional<X> method #40

Hi there,
coming from languages with sum types, is such a punishment to use java. We actually wrote handmade ADTs like your library is generating. I really like how less you have to type and what is generated for you. ❤️

This library already generates the

isX(): Boolean and asX(): X

we added in our hand wrote code a asSafeX(): Optional<X> method. This is more typesafe and could actually replace both methods

isX() is asSafeX().isPresent() and
asX() is asSafeX().get()

but you could also do typesafe stuff like asSafeX().map(x=>2*x).orElse(42)

Can you image to add this method?

Cheers Thomas