Use indentity hashes in Journey::GTG::Builder

actionpack/lib/action_dispatch/journey/gtg/builder.rb

 # frozen_string_literal: true
 
+
 require "action_dispatch/journey/gtg/transition_table"
 
 module ActionDispatch
@@ -18,8 +19,8 @@ def initialize(root)
 
         def transition_table
           dtrans   = TransitionTable.new
-          marked   = {}
-          state_id = Hash.new { |h, k| h[k] = h.length }
+          marked   = {}.compare_by_identity
+          state_id = Hash.new { |h, k| h[k] = h.length }.compare_by_identity
           dstates  = [firstpos(root)]
 
           until dstates.empty?
@@ -124,7 +125,7 @@ def lastpos(node)
 
         private
           def build_followpos
-            table = Hash.new { |h, k| h[k] = [] }
+            table = Hash.new { |h, k| h[k] = [] }.compare_by_identity
             @ast.each do |n|
               case n
               when Nodes::Cat