Mark: The `prfun` library in fact uses `Promise#timeout(n)` instead of a `TimeoutPromise` subclass. But this is really a language-design question. You might as well ask why we have `WeakMap()` as a constructor instead of using `Map#weak()` or `weakmapify(map)`. The fundamental reason is "so you can name (and thus test) the type of the object".
But this is really a question for the smalltalk folks. All I know is from googling "smalltalk species", for example: http://computer-programming-forum.com/3-smalltalk/fbb2ef6357ba0905.htm --scott
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