fastjson bug?报错

使用SerializerFeature.WriteClassName时，如果有Set属性一定会报错：

public static class X {
	private Set<Integer> y;

	public Set<Integer> getY() {
		return y;
	}

	public void setY(Set<Integer> y) {
		this.y = y;
	}
}

X x = new X();
x.y = Sets.newHashSet(1);
JSON.parse(JSON.toJSONString(x, SrializerFeature.WriteClassName));

但最后parse的时候是：

Exception in thread "main" com.alibaba.fastjson.JSONException: syntax error, expect {, actual Set, pos 39
at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:212)
at com.alibaba.fastjson.parser.deserializer.ASMJavaBeanDeserializer.parseRest(ASMJavaBeanDeserializer.java:96)
at Fastjson_ASM_XX2_2.deserialze(Unknown Source)
at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:320)
at com.alibaba.fastjson.parser.DefaultJSONParser.parse(DefaultJSONParser.java:1184)
at com.alibaba.fastjson.parser.DefaultJSONParser.parse(DefaultJSONParser.java:1153)
at com.alibaba.fastjson.JSON.parse(JSON.java:102)
at com.alibaba.fastjson.JSON.parse(JSON.java:93)

这是很久之前就有的一个bug，什么时候能解决