Extension question

First off, great work on the Extensions support, I am very excited about that and have already begun using them!

My question is just on idiomatic usage of the various lifecycle hooks. I've noticed that most only accept context, so I can't access other valuable information that I may want for my extension. Is it recommended to attach any data I need to context so it's available later in the lifecycle?

For example, if I'd like to use `graphql.Params` inside `ParseDidFinish`, would I attach to context?

Thanks again and great work!