[helb]

It doesn't seem to like non-ascii characters.

    "ěščřžý";
    "привіт";
    "<emoji><emoji>"; // HN stripped the actual emojis

turns into:

    "undefinedundefinedundefinedundefinedundefinedundefined";</br>
    "undefinedundefinedundefinedundefinedundefinedundefined";</br>
    "undefinedundefinedundefinedundefined";