rack/rack — pull request #502 by spastorino (2013-01-29 14:03:46+00:00)
Title: Add find and set methods to Session object

With this we can completely reuse Rack session object from Rails.
See https://github.com/spastorino/rails/blob/rack_15/actionpack/lib/action_dispatch/request/session.rb#L10-16

Backport to rack-1.5

/cc @raggi