=2.1 zval 写时复制 分离demo fix #33
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hello
在2.1 zval 章节中，您的写时复制的分离情况似乎有错误
PHP7 中，通过& 引用 标志赋值的，不会发生分离，而没有&引用的，指定type会发生写时复制，并且与原变量分离，pull request已经提交 ：）