Object::sealed

This loads the package.

First, we define an object that gets attributes Protected and Locked. We force argument evaluation of SetAttributes with Evaluate, because the function holds its arguments.

Trial to use ClearAll to get rid of object definitions, which must partly fail due to the object`s attributes. A first hint is the object number zero in the message below. We force argument evaluation of ClearAll with Evaluate, because the function holds its arguments.