promises-aplus/promises-spec — pull request #164 by briancavalier (2014-05-05 14:09:09+00:00)
Title: Clarify value/reason propagation

Specifically, add clause to clarify when onFulfilled/onRejected are
not functions, promise1's value/reason must be propagated.

Thanks @getify. See twitter convo:
https://twitter.com/getify/status/463297602084032513