[#SPIGOT-6234] enum classes don't serialize properly when implementing ConfigurationSerializable

enumerations that implement org.bukkit.configuration.serialization.ConfigurationSerializable aren't properly serialized to disk.

Given a configurationserializable class like this:

@SerializableAs("Hello")
enum Hello implements ConfigurationSerializable {
    FOO,
    BAR;

    @Override
    public Map<String, Object> serialize() {
        return Collections.singletonMap("variant", name());
    }

    public static Hello deserialize(Map<String, Object> map) {
        return Hello.valueOf((String) map.get("variant"));
    }
}

and an onEnable like this:

    @Override
    public void onEnable() {
        ConfigurationSerialization.registerClass(Hello.class, "Hello");

        File dataFolder = getDataFolder();
        dataFolder.mkdirs();

        File saveFile = new File(dataFolder, "test.yml");
        try {
            if (!saveFile.exists()) saveFile.createNewFile();

            YamlConfiguration yamlConfiguration = new YamlConfiguration();
            yamlConfiguration.set("hello", Hello.FOO);
            yamlConfiguration.save(saveFile);

            yamlConfiguration = YamlConfiguration.loadConfiguration(saveFile);
            Hello hello = (Hello) yamlConfiguration.get("hello");

            assert hello == Hello.FOO;

        } catch (IOException e) {
            getLogger().log(Level.SEVERE, "could not save or load test.yml", e);
        }
    }

it is expected that the contents of the test.yml savefile looks as follows:

hello: 
  ==: Hello
  variant: 'FOO'

but instead all that's there is:

hello: !!com.example.Hello 'FOO'

[SPIGOT-6234] enum classes don't serialize properly when implementing ConfigurationSerializable Created: 10/Nov/20 Updated: 17/Nov/20 Resolved: 17/Nov/20
Status:	Resolved
Project:	Spigot
Component/s:	None
Affects Version/s:	None
Fix Version/s:	None

[SPIGOT-6234] enum classes don't serialize properly when implementing ConfigurationSerializable Created: 10/Nov/20 Updated: 17/Nov/20 Resolved: 17/Nov/20