Sort trouble

[Stewart Gordon]

bearophile wrote:
<snip>
> - It can be more flexible (for example mine accepts an optional "key" mapping function)

What is there preventing a built-in sort being implemented to do this?

> - It can be a template, so it can be faster (confirmed. I have a sort that is sometimes 3+ times faster).
<snip>

What is there preventing a built-in sort being implemented in this way?

Stewart