Fetch does not return stale items

cache.go

@@ -81,12 +81,12 @@ func (c *Cache) Replace(key string, value interface{}) bool {
 	return true
 }
 
-// Attempts to get the value from the cache and calles fetch on a miss.
-// If fetch returns an error, no value is cached and the error is returned back
-// to the caller.
+// Attempts to get the value from the cache and calles fetch on a miss (missing
+// or stale item). If fetch returns an error, no value is cached and the error
+// is returned back to the caller.
 func (c *Cache) Fetch(key string, duration time.Duration, fetch func() (interface{}, error)) (*Item, error) {
 	item := c.Get(key)
-	if item != nil {
+	if item != nil && !item.Expired() {
 		return item, nil
 	}
 	value, err := fetch()