'Cancel' for PromiseKit option 2 #4
                
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These are the diffs for option 2 of Proposal for PromiseKit cancellation support #896. With option 2 the new cancellation code goes in a new PromiseKit extension called PMKCancel.
The repository for the new PMKCancel extension is currently hosted at https://github.com/dougzilla32/Cancel, but would be moved to https://github.com/PromiseKit/Cancel if option 2 is accepted.
There repositories with pull requests for option 2 are: