2.5.1: changes to "relation" attributes do not trigger a change event

Description

This jsfiddle, reproduces the issue I'm seeing in my website that uses the relational data layer of EnyoJS 2.5:
<http://jsfiddle.net/mephinet/0yzn1t0L/>

I have two collections (in the example "books" and "authors") that have a relation ("books.author" -> "authors"). I then attach an on-any-event-handler on the books collection: this.$.books.on("*", ...)
While this handler triggers on normal attribute's changes (e.g. the "title"), it does not trigger on a change of the relation's key (the "author").

Environment

Firefox 37.0a2

Status

Assignee

Screener (Enyo Team)

Reporter

mephinet

Labels

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External issue ID

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Old Issue Key

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Components

Affects versions

2.5.0

Priority

None
Configure