Which properties should be automatically tracked on the sublayer?

[madsmtm]

When the user passes a layer that is not CAMetalLayer, we create a new layer, insert it as a sublayer, and use observers to keep the new layer in sync with the super layer.

The properties of CALayer that we currently keep in sync is:

• bounds via. frame
• position, also via. frame
• contentsScale

And these are clearly the most important ones, but are there others that we should keep in sync? The opaque property? drawsAsynchronously?