It doesn't seem to like non-ascii characters.<p><pre><code> "ěščřžý";
"привіт";
"<emoji><emoji>"; // HN stripped the actual emojis
</code></pre>
turns into:<p><pre><code> "undefinedundefinedundefinedundefinedundefinedundefined";</br>
"undefinedundefinedundefinedundefinedundefinedundefined";</br>
"undefinedundefinedundefinedundefined";</code></pre>