Odd behavior with payload object with length attribute in Normalize Serializer Payload

[kalebdf]

Current Behavior

The array check (using Ember.isArray) in the SerializeResponse _normalizeSerializerPayload returns true for a payload object ([object Object]) with a length data attribute. This yielded a data object with several attributes with undefined as the value.

Ember: 1.13.2 & Ember Data: 1.13.2

Expected Behavior

A payload object with length data attribute should NOT be evaluated as an Array and go through the true block.

cc/ @bmac

---

The JSON API we were using returned a resource with several attributes one of which was length.

{
    "id": 123,
    "width": 10,
    "length": 15
}

Note: Don't use length or any possible reserved keywords in your API. We have changed our API to now return size_length vs. length. It goes along the same line as using lng vs. long for longitude.

[wecc]

Fixed by #3397.