[Seaside-dev] collecting expired stuff

[Sebastian Sastre]

hi there,
my dev image reached 100MB somehow so I'm making some instance cleaning.
I can see a request not found when sending #unregister to non collected
sessions.
I don't know yet why those sessions where not collected and is an issue of mine
for sure but I can't say the expiring technique of 2.9 is helping nor bullet
proof. 
Are that dependence really needed? I mean, to need a request context for
reaching the application of a session? 

sebastian