Foreach(f func(v T), ctx ...Executor)
	OnComplete(cb func(try Try[T]), ctx ...Executor)
	IsCompleted() bool
	//	Value() Option[Try[T]]
	Failed() Future[error]
	Recover(f func(err error) T, ctx ...Executor) Future[T]
	RecoverWith(f func(err error) Future[T], ctx ...Executor) Future[T]
}

type Try[T any] struct {
	v   *T
	err error
}

func (r Try[T]) IsSuccess() bool {
	return r.v != nil
}

type ByteBuffer struct {