Can't add ubytes together to make a ubyte... bug or feature?

[Adam D. Ruppe via Digitalmars-d-learn]

On Tuesday, 19 January 2016 at 22:12:06 UTC, Soviet Friend wrote:
> I don't care if my computer needs to do math on a 4 byte basis, 
> I'm not writing assembly.

x86 actually doesn't need to do math that way, if you were 
writing assembly, it would just work. This is just an annoying 
rule brought over by C.

> Can I prevent the initial implicit casts?

Nope, though you can help tell the compiler that you want it to 
fit there by doing stuff like

ubyte a = 200;
ubyte b = 100;
ubyte c = (a+b)&0xff;

or something like that, so the expression is specifically proven 
to fit in the byte with compile time facts.