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