From the post:

"This is annoying at the level of Arrays, but gets more difficult with more complex types, and function interactions. The recent brouhaha around the Promise/A+ highlights one such example: It is difficult to return a Promise of a Promise as a value from onFulfilled because then duck-wraps the return value as described in the Promise Resolution Procedure"

Could anyone share a pointer to this brouhaha around the Promise/A+ [spec, I assume]?