[Feature request] Object API keys should also support observable arrays

[YarnSphere]

All other object API functions support objects, arrays, and maps. I find it arbitrary that only the keys function does not support arrays. array.keys() is a thing; as well as Object.keys(array).

I agree that it might seem like a useless functionality, but I believe it's worth it for API consistency: all functions should work on all types of collections.

I, in fact, have a use for keys where I'd like not to worry about the type of the underlying collection (though I admit it is not a common use-case).

I'd be happy to provide a PR if you agree with my suggestion.

[lock]

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