Dumping Enum breaks in 1.19 - 1.21

First, thanks for a great product with snakeyaml.

While upgrading snakeyaml 1.10 to 1.21 I noticed an backward incompatibility with how snakeyaml dumps Java enums starting in 1.19. I've included a test case below that shows what I expect to happen. Essentially I would expect the enum to be dumped as just the name of the enum, just as it is in 1.10 through 1.18. Instead the enum is dumped as !!YamlTest$MyEnum$2 'B', which causes a YAMLException when trying to load it.

I am using Java 8.

public class YamlTest {

    public static class Bean {

        public MyEnum myEnum = MyEnum.B;

    }

    public enum MyEnum {
        A {}, B {};
    }

    /**
     * Test dumping enums. Works on Yaml 1.10 through 1.18. Fails on Yaml 1.19 through
     * 1.21.
     */
    @Test
    public void testYaml() {
        Yaml yaml = new Yaml();
        String text = yaml.dumpAs(new Bean(), Tag.MAP, FlowStyle.AUTO);
        Bean actual = yaml.loadAs(text, Bean.class);
        assertThat(actual.myEnum, is(MyEnum.B));
        assertThat(text, is("{myEnum: B}\n"));
    }

}

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