Fix nil signed/encrypted cookie value when value is stored as false

actionpack/lib/action_dispatch/middleware/cookies.rb

@@ -472,7 +472,13 @@ module ActionDispatch
 
       def [](name)
         if data = @parent_jar[name.to_s]
-          parse(name, data, purpose: "cookie.#{name}") || parse(name, data)
+          result = parse(name, data, purpose: "cookie.#{name}")
+
+          if result.nil?
+            parse(name, data)
+          else
+            result
+          end
         end
       end
 

actionpack/test/dispatch/cookies_test.rb

@@ -1282,6 +1282,20 @@ class CookiesTest < ActionController::TestCase
     end
   end
 
+  def test_signed_cookie_with_false_value_and_metadata
+    request.env["action_dispatch.use_cookies_with_metadata"] = true
+
+    cookies.signed[:foo] = false
+    assert_equal false, cookies.signed[:foo]
+  end
+
+  def test_encrypted_cookie_with_false_value_and_metadata
+    request.env["action_dispatch.use_cookies_with_metadata"] = true
+
+    cookies.encrypted[:foo] = false
+    assert_equal false, cookies.encrypted[:foo]
+  end
+
   def test_purpose_metadata_for_encrypted_cookies
     get :encrypted_discount_and_user_id_cookie