Hot Reloading `Maximum call stack size exceeded` error with circular reference

Say, there are two files `a.js` and `b.js`.

`a.js`: 

``` js
require('./b');
```

`b.js`:

``` js
require('./a')
```

After change one of this file, with Hot Reloading enabled, it will run into an infinite situation and cause `Maximum call stack size exceeded` finally.

Even if I use a dynamic require in a function, such as what in `b.js`:

``` js
function f(){
  require('./a')
}
```
