Nope.  Each rspec-core spec runs in an isolated sandbox that already has `RSpec.configuration` set to a unique instance for that example (among other things).  It's kinda hacky but it's what allows us to dog-food and have rspec-core test rspec-core and do things like define example groups and example within an example and run them.  See here:

https://github.com/rspec/rspec-core/blob/d5b58a496bc3c37932558e72bc72038fcc47660b/spec/spec_helper.rb#L67-L102

https://github.com/rspec/rspec-core/blob/d5b58a496bc3c37932558e72bc72038fcc47660b/spec/spec_helper.rb#L137