Cancelable promises proposal

[Glen Huang]

> On Aug 4, 2015, at 1:32 PM, Andrea Giammarchi <andrea.giammarchi at gmail.com> wrote:
> 
> only promises that has passed through their initialization the callback would be cancelable,and this could be reflected through a `.cancelable` property

That's precisely the problem. When you made a mistake and thought a function should have the ability to abort, you wouldn't reflect that `.cancelable` property, you would simply call abort(). Passing a different object makes this less likely to happen since it's not thenable.


> and pragmatists would never find out what should be the behavior once aborted 'cause Promise can only reject and never be ignored.

What do you think of the ignore() method I proposed?
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