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-rw-r--r--lib/rack/rewindable_input.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/rack/rewindable_input.rb b/lib/rack/rewindable_input.rb
index dd6b7843..97725091 100644
--- a/lib/rack/rewindable_input.rb
+++ b/lib/rack/rewindable_input.rb
@@ -1,4 +1,6 @@
 # -*- encoding: binary -*-
+# frozen_string_literal: true
+
 require 'tempfile'
 require 'rack/utils'
 
@@ -72,7 +74,7 @@ module Rack
         @unlinked = true
       end
 
-      buffer = ""
+      buffer = "".dup
       while @io.read(1024 * 4, buffer)
         entire_buffer_written_out = false
         while !entire_buffer_written_out