How to get all animated properties of a layer?

Hi guys! The subject is clear from the header.

I need to alter all keyframes of all properties of the particular layer.

So for the access to keyframe in AE script comes through the property it animate, am I need to traverse through all possible properies, the layer could have?

Or the layer object has a function like: "allKeyFrames()" or "AllAnimatedProperties()" - the way shortcut "U" works )))

thank you!