docs: public <U> FutureStream<U> fromIterableAsync(final Iterable<? extends Supplier<U>> actions) {
          final ReactiveSeq<? extends Supplier<U>> seq = actions instanceof List ? ReactiveSeq.fromList((List) actions)
                  : ReactiveSeq.fromIterable(actions);
          return this.<U> constructFutures(seq.map(next -> CompletableFuture.supplyAsync(next, getExecutor())));
      }