Either.when(), as a convenience for Option.when().toEither()

[jbrains]

I like Option.when(). I would also like Either.when(). Please consider it. I would add it myself, but I don't have the energy right now. I might try later.

Either.when(boolean condition, T ifTrue, Supplier<? extends R> ifFalse) { return Option.when(condition, ifTrue).toEither(ifFalse); }