cjohansen/Sinon.JS — pull request #119 by kpdecker (2012-04-15 16:43:05+00:00)
Title: Failover to property assignment in release

Seen under iOS 5.1 some system objects such as localStorage will fail silently on delete,
leaving the mock instance in place. This resolves that issue as best possible, using
a instance reset if the delete was not successful.