// returns minimal time needed
static long benchFor1Second(S desc, Runnable r) {
  ret benchForNSeconds(desc, r, 1);
}

static long benchFor1Second(Runnable r) {
  ret benchFor1Second(str(r), r);
}

// returns result of function
static <A> A benchFor1Second(S desc default str(f), IF0<A> f) {
  benchFor1Second(r { f! });
  ret f!;
}