@SuppressWarnings("unchecked") public <R>SimpleReactStream<R> from(final Collection<R> collection){
  return from(collection.stream());
}

@ SuppressWarnings ( "unchecked" ) public < R > SimpleReactStream < R > from ( final Collection < R > collection ) { return from ( collection . stream ( ) ) ; }
start a reactive flow from a collection using an iterator
