Add strict-container instances?

[Boarders]

This package seems like a really nice idea, I was wondering if it makes sense to piggyback off of strict-containers to add the necessary strict instances for these types?

[tomjaguarpaw]

Interesting idea. Unfortunately the conversion from lazy container to strict container is not zero cost, and zero cost conversion is an important design goal of this library.

[Boarders]

Ah, that's fair.