+0.06
+ - clarify the documentation on how to configure a backend
+ - due to stacked evals, certain start up errors were quietly
+ ignored until the first cache hit. These start up errors
+ now correctly manifest themselves at start up time.
+0.05
+ - change base class order to appease Class::C3
+
+0.04
+ - ???
+
0.03
- Be more compatible with ->set() convention of passing expiry