Re: [xhr] "Synchronous XMLHttpRequest outside of workers i..." (#59)

> Basically, since the main thread is the JavaScript thread, there's no way to freeze the latter without freezing the former.

This is implementation specific. The specification for XHR should not rely on this.
I.e.: Browsers should (1) interrupt processing of the script holding a pointer back, (2) launch the request, (3) continue script processing where it has been paused.

No where it says that synchronous calls should prevent "anything else" from happenning. 

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