Explain how customized clean rooms can be built using BasicObject for secure DSL evaluation.

BasicObject is the absolute root class in Ruby, containing no standard methods or inclusions. This makes it an ideal 'clean room' for evaluating external DSL configs without name collisions.

Standard Ruby classes inherit from Object, which includes the Kernel module and over a hundred default methods (like id, send, test, display). When building a domain-specific language (DSL) where user configurations might use these names, name collisions can easily occur. BasicObject does not inherit from Object or include Kernel, providing a minimal environment with only a few essential methods (like __send__ and instance_eval).…