Short form:
`"\u0130".toLowerCase()` increases the string's length. We can use that to break the custom serialization where length is checked before calling `toLowerCase`.

Read the [full version](https://upbhack.de/posts/google-ctf-qualifier-2018-writeup-bookshelf/) for details.

Original writeup (https://upbhack.de/posts/google-ctf-qualifier-2018-writeup-bookshelf/).