fix freezerLabel proper sort

[ehildenb]

@daejunpark we resurrected this branch from many months ago.

Can you make sure it's still relevant and makes sense?

If so we can add some tests and get it merged.

[msaxena2]

@daejunpark @ehildenb Is this ready for review? I guess this isn't really blocking, but it'd be good to get this in.

[ehildenb]

I've rebased on master. We need tests before this can be merged.