lib/active_support/json/encoding.rb in activesupport-6.0.6.1 vs lib/active_support/json/encoding.rb in activesupport-6.1.0.rc1

@@ -91,10 +91,14 @@
             when String
               EscapedString.new(value)
             when Numeric, NilClass, TrueClass, FalseClass
               value.as_json
             when Hash
-              Hash[value.map { |k, v| [jsonify(k), jsonify(v)] }]
+              result = {}
+              value.each do |k, v|
+                result[jsonify(k)] = jsonify(v)
+              end
+              result
             when Array
               value.map { |v| jsonify(v) }
             else
               jsonify value.as_json
             end