Ascii matters

[Don Clugston]

On 23/08/12 05:05, bearophile wrote:
> Sean Kelly:
>
>> I'm clearly missing something.  ASCII and UTF-8 are compatible.
>>  What's stopping you from just processing these as if they were UTF-8
>> strings?
>
> std.algorithm is not closed
> (http://en.wikipedia.org/wiki/Closure_%28mathematics%29 ) on UTF-8, its
> operations lead to UTF-32.

Which operations in std.algorithm over map 0-0x7F into higher characters?