Improve .create ergonomics and add cancelation-handling #24
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This PR includes two improvements to
AnyPublisher.create
:Instead of providing a raw closure, provides a subscriber-like argument with the familiar event-sending syntax of
send(_:)
,send(completion:)
.Allow providing a
Cancelable
-conforming object as the return of that closure, which is useful to provide cleanup-logic to your custom publisher.Thanks to @mbrandonw for the great ideas and feedback 🥇🥳