----- Original Message -----
> Ehsan Akhgari wrote:
> > There might be times where you want the concrete type of the thing
> > that your ctor function returns to be opaque, in which case it
> > might
> > make sense to go with the NS_NewFoo style of method.
> 
> That might even apply here, since my understanding was that mutable
> arrays need to be threadsafe when created off-main-thread and
> cycle-collected when created on-main-thread, or some such?

That's correct.  IMHO, the current state of affairs for bug 792169 is a little 
ugly, insofar as you do:

#include "nsArray.h"
...
  nsCOMPtr<nsIMutableArray> = nsArray::Create();
...

-Nathan
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