EntityModel enum map key not support

[xiaoyao9184]

spring-hateoas 1.1.2

code like this

    public enum EnumKey {
        K1,
        K2
    }

    @GetMapping("/test")
    @ResponseBody
    public ResponseEntity<EntityModel<Map<EnumKey,String>>> test() {
        Map<EnumKey,String> map = new HashMap<>();
        map.put(EnumKey.K1,"1");
        map.put(EnumKey.K2,"2");

        return ok(EntityModel.of(map));
    }

error

Could not write JSON: ****Controller$EnumKey incompatible with java.lang.String; nested exception is com.fasterxml.jackson.databind.JsonMappingException: ****Controller$EnumKey incompatible with java.lang.String (through reference chain: org.springframework.hateoas.EntityModel["[anySetter]"]->java.util.HashMap["K2"])

i think hateoas use @JsonAnyGetter and com.fasterxml.jackson.databind.ser.AnyGetterWriter use string key MapSerializer

spring-hateoas/src/main/java/org/springframework/hateoas/EntityModel.java

Lines 135 to 140 in 3b1559f

	@Nullable
	@JsonAnyGetter
	@SuppressWarnings("unchecked")
	private Map<String, Object> getMapContent() {
	return Map.class.isInstance(content) ? (Map<String, Object>) content : null;
	}

already use this added enum key serializer

still doesn't work, what is the correct way?