is_deeply $group2->custom_data_value('str'), '你好', 'Store a string in group custom data';
is_deeply $group2->custom_data_value('num'), '42', 'Store a number in group custom data';
is_deeply $group2->custom_data_value('bool'), '1', 'Store a boolean in group custom data';
is_deeply $group2->custom_data_value('str'), '你好', 'Store a string in group custom data';
is_deeply $group2->custom_data_value('num'), '42', 'Store a number in group custom data';
is_deeply $group2->custom_data_value('bool'), '1', 'Store a boolean in group custom data';