Ideas

Some ideas:

1. Add builder API for ThreadGroup (with wrapping?) - DONE
2. Add builder API for ThreadFactory (with wrapping?) - DONE
3. Add builder API for ThreadPoolExecutorService and alike - PENDING / ABANDONED
4. Promises.fromOptional(Optional<T>) -- to completed (success or failure) future - DONE as Promise.maybe
5. Promise.toOptional() -> Promise<Optional<T>> ??? -- DONE as PromiseOperations operator
6. Implements Iterable<T> for completed promise? Implements Stream for completed promise? -- DONE as AsyncCompletions
7. Promise.thenFilter - DONE

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After Aug 2020:

1. Asynchronous equivalent of Locks
2. Stabilization
3. Update docs

After Locks the library will be considered as 'feature-completed' and now new functionality is expected.