Authlogic tries to expire and change
the perishable token as much as possible, without comprising it‘s
purpose. This is for security reasons. If you want to manage it yourself,
you can stop Authlogic from getting
your in way by setting this to true.
When using the find_using_perishable_token method the token can expire. If
the token is expired, no record will be returned. Use this option to
specify how long the token is valid for.