gistfile1.diff

--- /Users/grb/.rvm/gems/ruby-1.9.3-p194@investments/gems/values-1.5.0/lib/values.rb	2013-06-17 19:28:23.000000000 -0700
+++ values.rb	2013-06-25 17:28:17.000000000 -0700
@@ -1,7 +1,7 @@
 class Value
   def self.new(*fields)
     Class.new do
-      attr_reader *fields
+      attr_reader :hash, *fields

       define_method(:initialize) do |*values|
         raise ArgumentError.new("wrong number of arguments, #{values.size} for #{fields.size}") if fields.size != values.size
@@ -10,6 +10,8 @@
           instance_variable_set(:"@#{field}", value)
         end

+        @hash = values.map(&:hash).inject(0, :+) + self.class.hash
+
         freeze
       end

@@ -32,10 +34,6 @@
         self.class == other.class && values == other.values
       end

-      def hash
-        values.map(&:hash).inject(0, :+) + self.class.hash
-      end
-
       def values
         self.class::VALUE_ATTRS.map { |field| send(field) }
       end