@Override default CompletableFuture<OptionalInt> minInt(final ToIntFunction<? super T> fn){
  return CompletableFuture.supplyAsync(null,getExec());
}

@ Override default CompletableFuture < OptionalInt > minInt ( final ToIntFunction < ? super T > fn ) { return CompletableFuture . supplyAsync ( null , getExec ( ) ) ; }
perform an asynchronous min operation
