Deduplicate strings held by the router

actionpack/lib/action_controller/renderer.rb

@@ -116,7 +116,7 @@ def normalize_keys(env)
 
       RACK_VALUE_TRANSLATION = {
         https: ->(v) { v ? "on" : "off" },
-        method: ->(v) { v.upcase },
+        method: ->(v) { -v.upcase },
       }
 
       def rack_key_for(key)

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -115,9 +115,9 @@ def initialize(set, ast, defaults, controller, default_action, modyoule, to, for
           @defaults = defaults
           @set = set
 
-          @to                 = to
-          @default_controller = controller
-          @default_action     = default_action
+          @to                 = intern(to)
+          @default_controller = intern(controller)
+          @default_action     = intern(default_action)
           @ast                = ast
           @anchor             = anchor
           @via                = via
@@ -222,6 +222,10 @@ def build_path(ast, requirements, anchor)
         private :build_path
 
         private
+          def intern(object)
+            object.is_a?(String) ? -object : object
+          end
+
           def add_wildcard_options(options, formatted, path_ast)
             # Add a constraint for wildcard route to make it non-greedy and match the
             # optional format part of the route by default.

actionpack/test/dispatch/routing_test.rb

@@ -3379,13 +3379,13 @@ def test_colon_containing_custom_param
     assert_match(/:param option can't contain colon/, ex.message)
   end
 
-  def test_action_from_path_is_not_frozen
+  def test_action_from_path_is_frozen
     draw do
       get "search" => "search"
     end
 
     get "/search"
-    assert_not_predicate @request.params[:action], :frozen?
+    assert_predicate @request.params[:action], :frozen?
   end
 
   def test_multiple_positional_args_with_the_same_name