Function distinct_until_changed_with 

pub fn distinct_until_changed_with<F>(
    core: &Core,
    binding: &Arc<dyn OperatorBinding>,
    source: NodeId,
    equals: F,
    opts: OperatorOpts,
) -> OperatorRegistration
where
    F: Fn(HandleId, HandleId) -> bool + Send + Sync + 'static,

distinct_until_changed with explicit OperatorOpts.