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-rw-r--r--lib/rack/runtime.rb6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/rack/runtime.rb b/lib/rack/runtime.rb
index bb15bdb1..d2bca9e5 100644
--- a/lib/rack/runtime.rb
+++ b/lib/rack/runtime.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rack/utils'
 
 module Rack
@@ -8,8 +10,8 @@ module Rack
   # 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