How can we recognise solution's uniqueness?

Hi guys.

During the last Video-Code-Review bring a simple idea and after that I can’t stop thinking about it.

Is it possible to differentiate solution by uniqueness?

Can I say how one solution is different from another?

Can CheckiO eventually give uniqueness-score for solution after sharing?

This might be interesting to solve for CheckiO not only because of removing duplicates, but also to show user the most unique solution first.

Please, share anything that pops in your mind :) I’m sure, implementation of this idea in CheckiO will make it 10 times better.