Are Node Fibers Blocking?
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If you run an I/O intensive task in Node.js, like some async database operation, using [node-fibers](https://github.com/laverdet/node-fibers/), is it blocking?

I haven't used node-fibers yet b/c it seems that -- if used in code that processes an HTTP request in which some long normally-non-blocking I/O code is run -- it would now prevent other requests from accessing your app. Is this true or not? A little detail on why it's true/false would be very helpful as well.