lib/divining_rod/mash.rb in divining_rod-0.6.2 vs lib/divining_rod/mash.rb in divining_rod-0.6.3

@@ -3,11 +3,11 @@
 
     def initialize(hsh = {})
       self.replace(hsh || {})
     end
 
-    def merge(opts = {})
-      return self if opts.nil?
+    def merge(opts)
+      opts = opts.dup
       if self[:tags] || opts[:tags]
         tags = Array(self[:tags]) | Array(opts[:tags])
         opts[:tags] = tags
       end
       super(opts)