std::string responsible for half the allocations in chrome

[Joseph Rushton Wakeling via Digitalmars-d]

On 05/12/14 23:03, deadalnix via Digitalmars-d wrote:
> http://www.reddit.com/r/programming/comments/2ocmvb/stdstring_is_responsible_for_almost_half_of_all/
>
> Looks like someone need immutable(char)[] .

Someone asked me the other day, and I realized I didn't have a ready answer as 
I'd never particularly considered it: why is it important/beneficial that the 
string type be immutable(char)[] ?