How does lexical node prevents writing to the node without calling getWritable

[yf-yang]

I noticed when I inherit a new lexical node, then directly call an assignment without calling getWritable, it would throw an error:
TypeError: Cannot assign to read only property 'field' of object '#<NodeName>

I remember some versions earlier, the behavior is that the node will not rerender (because it is not be marked as dirty during reconcilation stage). However, this time I checked the source code and didn't find how it is implemented. By calling Object.getOwnPropertyDescriptor, I found after calling $getNodeByKey and retrieve the node from activeEditorState._nodeMap, the property's writable field is set to false and after calling getWritable, the cloned node's corresponding property has writable = true, but I didn't find any clue that you explicitly set those fields as read only.

I am just curious, how do you implement that? Could you please share some insights?

[yf-yang]

Got it, #652, thanks