custom store? docs? API?

[jrochkind]

Are there any docs or documented API for writing a new back-end store?

For my own odd purposes, I would like to use a store backed by ActiveRecord (yes,obviously not very performant, but suits my needs).

I could write it up and submit a pull request... but this is probably not of general interest. Is there any way for me to create a Rack::Cache store that lives in it's own gem, and still works with Rack::Cache?