Is it safe to use 'is' to compare types?

[Yuxuan Shui via Digitalmars-d-learn]

On Tuesday, 8 March 2016 at 23:13:32 UTC, Anon wrote:
> On Tuesday, 8 March 2016 at 20:26:04 UTC, Yuxuan Shui wrote:
>> [...]
>
> [Note: I phrase my answer in terms of Linux shared libraries 
> (*.so) because D doesn't actually have proper Windows DLL 
> support yet. The same would apply to DLLs, it just feels wrong 
> describing functionality that doesn't exist.]
>
> [...]

Can we left TypeInfo symbol undefined in the shared libraries? 
i.e. D compiler will strip out TypeInfo definition when creating 
.so. (Alternatively, we can have TypeInfo always undefined in .o, 
and generate them in linking stage only when creating executables)