Add eve-auto-index support for canvas paths and operations (The sort attribute is no longer required if you statically list all operations as children of their path, etc.)
Simple bind block will copy radius attribute of ellipse operations into radiusX and radiusY for you.
Default values for frequently unused operation fields allow them to be omitted. E.g.
radiusattribute of ellipse operations intoradiusXandradiusYfor you.