amatsuda/kaminari — pull request #282 by yuki24 (2012-09-07 05:32:41+00:00)
Title: Make Kaminari.config.default_per_page changeable again 

This is a fix for #280. The change in @eaca75e breaks one of spree's specs so I've just reverted the change.
I believe this doesn't effect anything including performance though `@var ||= config.value` style is usually preferred.