Allocate the "ruby" and "\0" Strings once.

lib/bundler/index.rb

@@ -13,6 +13,9 @@ def self.build
     attr_reader :specs, :all_specs, :sources
     protected :specs, :all_specs
 
+    RUBY = "ruby".freeze
+    NULL = "\0".freeze
+
     def initialize
       @sources = []
       @cache = {}
@@ -68,7 +71,7 @@ def search(query, base = nil)
         end
       end
 
-      results.sort_by {|s| [s.version, s.platform.to_s == "ruby" ? "\0" : s.platform.to_s] }
+      results.sort_by {|s| [s.version, s.platform.to_s == RUBY ? NULL : s.platform.to_s] }
     end
 
     def local_search(query, base = nil)