Re: [fetch] Aborting a fetch (#27)

> why my proposal that exposes cancel-ability only if internally provided wouldn't work, exactly?

You never addressed my earlier concern than a general implicitly-creating-promise type mechanism, like `async function`, provides no clear way to tell the promise "make me cancelable" in any useful way. 

`fetch(..)` can do so by adding some explicit parameter to its API, which it automatically funnels into its promise. But a general `async function` cannot, not without ugly side-effects on composability/signature design.

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