mrdoob/three.js — comment on commit b23690f90bd2ae43f87efd6b5b7f62b9c612664a
File:  line 0
By alteredq:

> Removed ?rnd= bit, not sure why that was there...

I used to do this to get around too aggressive caching in browser. It can get annoying when you develop and files you load don't reflect your local changes. But yes, this should be optional, not that good for deployment, where you want caching.