How does GC.addRange work?

[Gary Willoughby via Digitalmars-d-learn]

On Saturday, 20 September 2014 at 20:44:18 UTC, ketmar via 
Digitalmars-d-learn wrote:
> note that scan is conservative, so if you happen to have some 
> integer
> value that can be interpreted as pointer to GC-managed memory, 
> it will
> be considered as pointer.

So zeroing values will inform the GC the reference has gone?