Represents a org.reactivestreams.Subscription that can be assigned
only once to another subscription reference.
If the assignment happens after this subscription has been canceled, then on
assignment the reference will get canceled too. If the assignment
after request(n) has been called on this subscription, then
request(n) will get called immediately on the assigned reference as well.
Useful in case you need a thread-safe forward reference.
The Subscription represents a cross between the
Monix Cancelable and
Represents a one-to-one lifecycle of a Subscriber subscribing to a Publisher
and mirrors the Subscription interface from the
Reactive Streams specification.
It can be used only once by a single Subscriber. It is used
for both signaling demand for data and for canceling demand (and allow