Bug: Data Element storage duration and Data Element Changed rule

[#1]

Scenario:

On my page, I have a data layer declared like this:

var dataLayer = {

  page: {

    ...

  }

};

Notice that the dataLayer in my page doesn't have a "foo" key declared. This key is appended later through a script on the page.

Launch setup:

I have a data element declared like this:

Name: foobar

Type: JavaScript variable

Variable name: dataLayer.foo.bar

Storage Duration: Pageview

I have a rule declared like this:

Event type: Data Element Change

Data Element Name: foobar

Steps to reproduce:

1. Load the page where the dataLayer does not include a "foo" key.

2. Append the "foo" key to the dataLayer through a script later.

Expected result:

The Data Element Change rule fires.

Actual result:

The Data Element Change rule does not fire.

BUT....

Steps to reproduce (continued):

3. Change the Data Element's Storage Duration to "None".

4. Build the library.

5. Change the Data Element's Storage Duration back to is original "Pageview".

6. Build the library.

Actual result:

The Data Element Change rule fires.