Mount IDBFS to root "/" path

[GregSlazinski]

I'm trying to mount IDBFS to "/" to make entire filesystem persistent:
FS.mount(IDBFS, {}, '/');
However this generates an exception device busy.
Since MEMFS is mounted to "/" by default, I've tried to unmount it using:
FS.unmount('/');
But then I get an exception thrown: Error: Invalid argument,Error

Is it not possible to mount IDBFS to "/" ?

[kripken]

Yes, there is a current limitation on not being able to mount the root dir, see #2040