All citizens are bound in the public sphere of life by the same set of laws and have formal equality irrespective of gender, ethnicity, religion, age or sexual orientation - allowing individuals to live their private lives as they see fit - but as such this confines multi-culturalism to the private sphere, a perspective that is heavily challenged.
One could say this of France...
I see diversity as actually being a very public sphere thing here, whereas what I understand of the French system more accurately fits that quote. Ad astra per aspera