[QUESTION]循环引用时如何正常输出内容而非“$ref”

我的map中有两个同级字段A,B，我使用 map.put(B,A)，然后“JSONObject.toJSONString(map)”，如何让其不打印"$ref"而是在B中正常打印A的值呢？

Reproduce the case where a map has sibling fields A and B, B references A via map.put(B, A), and JSONObject.toJSONString(map) emits "$ref". Start by reading the serialization behavior for circular references; done means the B output contains A's value instead of "$ref".

Written by the indexing model from the issue text.