As Domenic mentions, there will be no place for "done" in our bright promise debugger future.
It will however be necessary for promise users to keep on ending their chains with "done()" until promise debuggers are ubiquitously available. This is a simple problem. If you are writing code that targets both old and new engines, the promise polyfill will simply have to patch a no-op "done" onto the engine’s Promise.prototype. Kris Kowal
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