Why not use the address of the TypeInfo symbol as TypeInfo.toHash()?

[Yuxuan Shui via Digitalmars-d]

On Friday, 4 March 2016 at 00:42:28 UTC, Walter Bright wrote:
> On 3/3/2016 4:29 PM, Yuxuan Shui wrote:
>> After linking each _DxxTypeInfo_yyyy__initZ symbol should have 
>> a unique address,
>> so why are we using hash of type name as TypeInfo.toHash()?
>> I don't think this has anything to do with compacting GC. Is 
>> there something I'm
>> missing?
>
> Because when working with DLLs (shared libraries) there may be 
> more than one TypeInfo per type.

Hmmm, can we left _DxxTypeInfo_yyyy__initZ undefined in the 
shared libraries?