Executors.newVirtualThreadPerTaskExecutor() leaks CompletableFuture

[Kasper Nielsen]

Hi,

I don't know if it is much of an issue in practice but you can cast the
futures returned from Executors.newVirtualThreadPerTaskExecutor
to CompletableFuture:

ExecutorService e = Executors.newVirtualThreadPerTaskExecutor();
CompletableFuture f = (CompletableFuture<?>) e.submit(() -> {});

Other executors return instances of FutureTask which is probably less
likely to be abused.

/Kasper