code: public static Function<? super ReactiveSeq<Long>, ? extends ReactiveSeq<Long>> mapLongs(LongUnaryOperator b){
  
          return a->a.longs(i->i,s->s.map(b));
      }
docs: /*
  Fluent transform operation using primitive types
  e.g.
  <pre>
  {@code
  import static cyclops.ReactiveSeq.mapLongs;
  
  ReactiveSeq.ofLongs(1l,2l,3l)
  .to(mapLongs(i->i*2));
  
  //[2l,4l,6l]
  }
  </pre>