Not understanding how to configure bluebird as the default promise library

[Barry Kaplan]

I have:

M = require "mongoose"
P = require "bluebird"
M.Promise = P

I see that bluebird is set into the Promise property defined in index.js.

But when, say, mode.create(...) is invoked it does new Promise() which returns an mpromise instance (model.js:1603)

What am I missing? Should Model.create be using PromiseProvider.get ?