hashOf vs. typeid(T).getHash

[Steven Schveighoffer]

On 10/8/23 11:24 AM, Steven Schveighoffer wrote:
> But the problem I see here is that `hashOf` is provided by druntime, and 
> `TypeInfo.getHash` is provided by druntime. Both of these should be 
> *exactly the same*.
> 
> I want to know:
> 
> a) why was the note added?
> b) can we get rid of the note (with appropriate unittests)?
> c) I found one example where they don't match, `double[2]`. Can anyone 
> find other types that fail? I think we should fix these so they are the 
> same.

I've settled on the following "solution":

1. I will add a new `hashOfAA` function that performs the same as 
`TypeInfo.getHash`
2. Most of these calls will just forward to `hashOf`
3. The ones that might differ, I will follow whatever `TypeInfo` does.
4. Add all the unittests to make sure all the types hash the same at 
compile time, runtime, and via typeinfo.

-Steve