Sails.js object has undefined collection after populate

Whenever I populate a collection in Sails.js, the values are populated inside modelName.associations.collectionName.value. The value of modelName.collectionName is always undefined even though when I represent the object as JSON everything is shown perfectly.

Taking the example of a Many-to-Many relationship given in the documentation (http://sailsjs.org/#/documentation/concepts/ORM/Associations/ManytoMany.html), if I do the following query:

User.findOne(1)
.populate('pets')
.exec(function(err, owner) {...});

I would get the pets collection in owner.associations.pets.value, but owner.pets is undefined.

Any ideas what is going on here?

EDIT:

I have replicated the exact same example given in the documentation (the same Pet.js, User.js and bootstrap.js) and I have overridden the findOne blueprint of User.js in this way:

findOne: function (req, res) {

  User.findOne(req.params.id)
    .populate('pets')
    .exec(function(err, owner) {
      if (err) return res.send(err, 500);
      return res.json(owner);
    });

}

As I expected, the JSON response is alright, but if I set a breakpoint inside the exec(..) function, owner.pets is undefined. The data is only in owner.associations.pets.value.

Could it be my version of Sails.js? It's 0.10.0-rc11.