Export `Stats(..)`

[tibbe]

Export `Stats(..)`

[tibbe]

It's not exposed because I want to be able to change the implementation (e.g. to add support for quantiles). However, I am open to adding e.g. Binary instances or explicit decode/encode methods that could be used to transport stats over the network.

[Fuuzetsu]

That would work too. I didn't see binary dependency (though it's probably a transitive one) so I assumed exposing constructor would be less of a change.

Generic and Typeable would be nice too while you're changing it (from base).

[tibbe]

I think depending on binary is OK. If we don't want to commit to a specific library we could instead just offer:

encodeStats :: Stats -> ByteString
decodeStats :: ByteString -> Maybe Stats

This would allow us to change to use cereal or whatever in the future.