This is in the spec, but was not implemented in the polyfill. The only relevant option is credentials, which can be forwarded to the XMLHttpRequest used to load Worklets.

Would it be possible to add the Origin Rebase feature that is built into Physx 4.x and up into Echo?

This would enable larger worlds to be made without floating point precision errors. Here is an example of what can happen if you are too far away from origin. https://gyazo.com/a96db2d1a4ef8ff8935d2054597e151b

It would be nice if we could enable it in project settings and it was just part of