That does not state anything about object keys (not that we follow this guide anyway). Object.freeze enforces the "constant" being constant. If you want to use the `I_AM_CONSTANT_REALLY` style inside of the object I would argue that we should not be using the object in the first place. 

I will also argue that Objects are types and the type has been made immutable by Object.freeze so the keys themselves should follow guidelines for all other object types (camelCase property naming).