class BasicObject

def === (cmp)
  true
end

Seems really though to get right, but pull requests welcome ;-)
and M.method_added for any module M included in Object or a submodule
Ideally, we'd do this by trapping Object.method_added
We'll do this whenever a class is derived from BasicObject
either directly or through an included module.
Let's try to keep things clean, in case methods have been added to Object

def inherited(sub)
  BasicObject.class_eval do
    (instance_methods - KEEP).each do |method|
      if Object.method_defined?(method) && instance_method(method).owner == Object.instance_method(method).owner
        undef_method method
      end
    end
  end
end