3 ms·That's an ES5 change. With ES3, you can overwrite NaN, Infinity, and undefined.by ahoge 12y agoThat's an ES5 change. With ES3, you can overwrite NaN, Infinity, and undefined.LunaSea 12y agoOnly in strict mode I though no ?ahoge 12y agoGenerally. Technically, it's a "breaking change". As you can imagine, this didn't actually affect anyone.