nsIObjectOutputStream in Firefox 3.5

 Optimized serialization support -- see nsIStreamBufferAccess.idl.

 Write the object referenced by an interface pointer at aObject that
 inherits from a non-primary nsISupports, i.e., a reference to one of
 the multiply inherited interfaces derived from an nsISupports other
 than the root or XPCOM-identity nsISupports; or a reference to an
 inner object in the case of true XPCOM aggregation.  aIID identifies
 this interface.

 Write the object whose "root" or XPCOM-identity nsISupports is aObject.
 The cause for writing this object is a strong or weak reference, so the
 aIsStrongRef argument must tell which kind of pointer is being followed
 here during serialization.

 If the object has only one strong reference in the serialization and no
 weak refs, use writeSingleRefObject.  This is a valuable optimization:
 it saves space in the stream, and cycles on both ends of the process.

 If the reference being serialized is a pointer to an interface not on
 the primary inheritance chain ending in the root nsISupports, you must
 call writeCompoundObject instead of this method.

 Write an object referenced singly and strongly via its root nsISupports
 or a subclass of its root nsISupports.  There must not be other refs to
 aObject in memory, or in the serialization.