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-rw-r--r--ext/json/lib/json/add/core.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/json/lib/json/add/core.rb b/ext/json/lib/json/add/core.rb
index 77d9dc0b20..93b2bff424 100644
--- a/ext/json/lib/json/add/core.rb
+++ b/ext/json/lib/json/add/core.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# This file requires the implementations of ruby core's custom objects for
# serialisation/deserialisation.