Vibrance adjustment layer missing adjustment object with default values

[vrahikka]

I need to get the adjustment values for different adjustment layers. It seems that if the adjustment layers have default values (e.g. Exposure has 0, 0, 0 as exposure, offset and gamma) those values are not included in the adjustment object at all. This is not a problem, I can just hard coded default values in my code if the values are missing. The problem is Vibrance adjustment layer. It does not contain adjustment object at all with default values. Adjustment object contains class property which indicates which adjustment layer type it is. So in this case I cannot know what type of adjustment layer is in question. Also color lookup and invert do not contain adjustment objects on default settings and because you can't modify invert it does never contain adjustment object.

Is there something I'm missing here or is this a bug?