static <A> ArrayList<A> cloneList_noSync(Iterable<A> l) {
  ret l instanceof Collection ? cloneList_noSync((Collection) l) : asList(l);
}

static <A> ArrayList<A> cloneList_noSync(Collection<A> l) {
  if (l == null) ret new L;
  ret new ArrayList<A>(l);
}

Began life as a copy of #1001634