inconsistent property definition
This caught me out when browsing the new docs http://developer.sketchapp.com/reference/api/

Sometimes read-only properties are in the properties table at the top of the object, sometimes they're separate in the body. In the old docs, the difference between properties and methods was very clear, but in this new format, the lines are blurred

An example here is `Document`. The `pages` property is hidden in the object body, and not shown in the properties table. Whereas for `Group`, the `layers` property is in the properties table