Wrong reasoning for why `$q.when()` required no extra work to adopt foreign promises
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prashantpalikhe commented
Notice that we didn’t really have to do anything to make the adoption of foreign Promises work. That’s because our then implementation already knows how to wrap a foreign Promise, and when merely wraps then.
then
implementation is not aware of wrapping foreign promise, resolve
is.
defer.resolve(value)
knows if the value being passed is a thenable (foreing promise) and waits until the foregin promise is resolved before resolving itself.