OptionalAlignmentBinaryFunction
class OptionalAlignmentBinaryFunction<A, OA : ObservableValue<A>, B, OB : ObservableValue<B>>(argA: OA, argB: OB, lambda: (A, B) -> Alignment?) : BinaryFunction<Alignment?, A, OA, B, OB> , ObservableOptionalAlignment
Boilerplate which avoids having to use generics.
Similar to AlignmentBinaryFunction, but the value can also be null.