internal-slot

Per https://github.com/ljharb/object.assign/pull/81 travis-ci's new pricing plan, and its defaults, have caused all my repos to have zero CI whatsoever until December. @travis-ci Support is MIA, so I unfortunately can't rely on it as a service anymore.

I feel like this might work, but might not be intentional: I think it’d be much better if returned a constructor for an class that would have the same instance methods as the current object, but each instance would have its own .