Apparently unsigned types really are necessary

[Mail Mantis]

2012/1/22 Walter Bright <newshound2 at digitalmars.com>:
> http://news.ycombinator.com/item?id=3495283
>
> and getting rid of unsigned types is not the solution to signed/unsigned
> issues.

Would it be sane to add integer overflow/carry runtime checks in
-debug builds? This could probably solve such issues, but we'd need
some means to avoid this checks when nesessary.