lib/rack/flash.rb in rack-flash3-1.0.2 vs lib/rack/flash.rb in rack-flash3-1.0.3

@@ -47,10 +47,10 @@
         [cache, values].any? { |store| store.keys.include?(key.to_sym) }
       end
       alias_method :include?, :has?
 
       def keys
-        cache.keys.merge(values.keys)
+        cache.keys | values.keys
       end
 
       # Mark existing entries to allow for sweeping.
       def flag!
         @flagged = values.keys