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-rw-r--r--lib/axlsx/workbook/worksheet/cell_serializer.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/workbook/worksheet/cell_serializer.rb b/lib/axlsx/workbook/worksheet/cell_serializer.rb
index 94a1f93a..3c8f87dc 100644
--- a/lib/axlsx/workbook/worksheet/cell_serializer.rb
+++ b/lib/axlsx/workbook/worksheet/cell_serializer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# The Cell Serializer class contains the logic for serializing cells based on their type.
class CellSerializer