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-rw-r--r--lib/axlsx/util/validators.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/util/validators.rb b/lib/axlsx/util/validators.rb
index b6877a48..952827e9 100644
--- a/lib/axlsx/util/validators.rb
+++ b/lib/axlsx/util/validators.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# Validate a value against a specific list of allowed values.
class RestrictionValidator