Canonical GObject property names omitted from both reading and writing.
Override this in the model; no Settings registration is needed. Only bidirectional properties are mapped by default, so computed get-only and input-only set-only properties need no entry here. Ordinary construct properties are assigned after object creation. A construct-only property needs an explicit constructor codec; if it is also ignored here, list it in the codec's ignored_properties so it can be excluded before the instance exists.