删除节点后，把节点重新赋值给另一个孩子节点，修改值无效

[fantasticsoul]

见下面的代码示例，final.c.c2.test依然是2

  const base = { a: 1, b: { test: 2 }, c: { c1: 1 } };
  const draft = createDraft(base);
  const b = draft.b;
  delete draft.b;
  draft.c.c2 = b;
  draft.c.c2.test = 1000;
  const final = finishDraft(draft);
  // <= 3.12.4 (final.c.c2.test) is 2;
  // the right value of (final.c.c2.test) should be 1000;
  console.log(final);

[fantasticsoul]

fixed at 3.13.1+