Unwrap value in isObservableArray

[marcovdb]

This will allow the extender to work on a computed observable as well (as long at it's an array, which makes sense).

[coveralls]

Coverage decreased (-1.2%) to 96.429% when pulling 9d1ec68 on marcovdb:patch-1 into 162882f on ErikSchierboom:master.

[guilhermewaess]

@marcovdb Nice work, by the way looks like you can write some tests for this feature, what you think? ;)
But is just a advise <- this turns more easy to @ErikSchierboom accept the PR

[ErikSchierboom]

@marcovdb Love it! As @guilhermewaess mentioned, having one or more tests for this feature would be super helpful. Would you be willing to add a test?

[marcovdb]

Admittedly I don't have much experience with automated tests, but I'll see what I can do!

[ErikSchierboom]

@marcovdb Just give me a shout if you need any help!

[coveralls]

Coverage decreased (-2.2%) to 95.402% when pulling da103c2 on marcovdb:patch-1 into 162882f on ErikSchierboom:master.

[marcovdb]

Okay, I added a few unit tests. I'm not sure why this has actually decreased the coverage but as I said, I'm kind of new at this.

[ErikSchierboom]

@marcovdb Thanks for adding the tests. This is great work! I've just merged this PR and released a new version (0.4.0) that includes this improvement. Thanks again!