docs: static UnionImpl initNewHeapInstance(final int lgNomLongs, final long seed, final float p,
        final ResizeFactor rf) {
      final UpdateSketch gadget = new HeapQuickSelectSketch(
          lgNomLongs, seed, p, rf, true); //create with UNION family
      final UnionImpl unionImpl = new UnionImpl(gadget, seed);
      unionImpl.unionThetaLong_ = gadget.getThetaLong();
      unionImpl.unionEmpty_ = gadget.isEmpty();
      return unionImpl;
    }