I have found that isNumeric() accepts "+", but toInt() chokes on it. I guess whatever isNumeric() says is ok should be safe to pass on to isInt() and isFloat().

Here is a quick diff to std/string.d (0.137) that solves this problem, I have not done any further analyzis of compatibility of isNumeric() and toInt() and toFloat().

3136c3136,3140
<         j++;
---
>     {
>         j++;
>         if (j == iLen)
>             return false;
>     }


//Fredrik Olsson