Defining methods inside RSpec.configure blocks still defines them on
Object. Use config.include with a module to define these only in the
specs and not globally.
For matcher methods, define them in RSpec::Matchers::DSL::Matcher.
Change rubocop config to allow this inside of the RSpec.configure
blocks (technically, any constant inside any block).
Add an Object.method_added hook that raises an exception if defining
a method on object, other than Nokogiri, which is defined by the
nokogiri gem. This will result in the specs raising an error without
executing anything if you attempt to define a method on Object.
60e129bd84