Another unrelated experiment

lib/chrono_model/adapter/migrations.rb

@@ -105,31 +105,18 @@ def drop_table(table_name, *)
       # temporal schema and to the history one. If the `:unique` option is
       # present, it is removed from the index created in the history table.
       #
-      def add_index(table_name, column_name, options = {})
+      def add_index(table_name, column_name, **options)
         unless is_chrono?(table_name)
-          return super if RUBY_VERSION < '3.0.0'
-          return super(table_name, column_name, **options)
+          return super
         end
 
         transaction do
-          on_temporal_schema do
-            if RUBY_VERSION < '3.0.0'
-              super
-            else
-              super(table_name, column_name, **options)
-            end
-          end
+          on_temporal_schema { super }
 
           # Uniqueness constraints do not make sense in the history table
           options = options.dup.tap {|o| o.delete(:unique)} if options[:unique].present?
 
-          on_history_schema do
-            if RUBY_VERSION < '3.0.0'
-              super table_name, column_name, options
-            else
-              super table_name, column_name, **options
-            end
-          end
+          on_history_schema { super }
         end
       end