Why can't D store all UTF-8 code units in char type? (not really understanding explanation)

[thebluepandabear]

On Friday, 2 December 2022 at 23:44:28 UTC, thebluepandabear 
wrote:
>> :-D
>>
>> (Exercise for the reader: what's the Hausdorff dimension of 
>> the set of strings over Unicode space? :-P)
>>
>>
>> T
>
> Your explanation was great and cleared things up... not sure 
> about the linear algebra one though ;)

Actually now when I think about it, it is quite a creative way of 
explaining things. I take back what I said.