runtime.rb in rack-2.1.0

- old
+ new

@@ -1,16 +1,18 @@
+# frozen_string_literal: true
+
 require 'rack/utils'
 
 module Rack
   # Sets an "X-Runtime" response header, indicating the response
   # time of the request, in seconds
   #
   # You can put it right before the application to see the processing
   # time, or before all the other middlewares to include time for them,
   # too.
   class Runtime
-    FORMAT_STRING = "%0.6f".freeze # :nodoc:
-    HEADER_NAME = "X-Runtime".freeze # :nodoc:
+    FORMAT_STRING = "%0.6f" # :nodoc:
+    HEADER_NAME = "X-Runtime" # :nodoc:
 
     def initialize(app, name = nil)
       @app = app
       @header_name = HEADER_NAME
       @header_name += "-#{name}" if name