Can we disallow appending integer to string?

[XavierAP via Digitalmars-d-learn]

On Wednesday, 19 April 2017 at 14:50:38 UTC, Stanislav Blinov 
wrote:
> On Wednesday, 19 April 2017 at 14:36:13 UTC, Nick Treleaven
>>
>> Why is it legal to append an integer?
>
> Because integrals implicitly convert to characters of same 
> width (byte -> char, short -> wchar, int -> dchar).

Huh... I hadn't used but I'd been assuming probably biased from 
C# that
str ~ i
would be equivalent to
str ~ to!string(i)
instead of
str ~ cast(char) i

Now I see the problem too...