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-rw-r--r--lib/unicode_normalize.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/unicode_normalize.rb b/lib/unicode_normalize.rb
index e79f41d1a2..8daf7b301a 100644
--- a/lib/unicode_normalize.rb
+++ b/lib/unicode_normalize.rb
@@ -1,4 +1,5 @@
# coding: utf-8
+# frozen_string_literal: false
# Copyright Ayumu Nojima (野島 歩) and Martin J. Dürst (duerst@it.aoyama.ac.jp)