code: public final Ix<Boolean> any(IxPredicate<? super T> predicate) {
          return new IxAny<T>(this, nullCheck(predicate, "predicate is null"));
      }
docs: Emits true if any element of this sequence matches the given predicate,
  false otherwise (or for empty sequences).
  <p>
  The result's iterator() doesn't support remove().
  @param predicate the predicate receiving each element
  @return the new Ix instance
  @throws NullPointerException if predicate is null
  @since 1.0