Merging one Array with Another

[Ilya Yaroshenko via Digitalmars-d-learn]

fix:

  	completeSort(x.assumeSorted, y);
  	x = x.chain(y).uniq.array;

  or  (was fixed)

         y = y.sort().uniq.array;
  	completeSort(x.assumeSorted, y);
  	x ~= y;