On Sunday, 6 October 2019 at 08:27:35 UTC, Seb wrote:
Well, my guess it will be similar [...]
If you're not the one making those decisions it may be better not to prejudge them. A significant performance improvement is a different beast to moderate API/usability improvements.
A standard library is _not_ supposed to be a place where actual battle-testing happens. It's where things move when they have been tested and no longer change.
You misunderstand what I mean by "battle-testing". Clearly designs should go through a high level of testing and usage before they go anywhere near the standard library. But the very fact of being placed in the standard library exposes them to orders of magnitude more usage, and hence gives a much stronger guarantee of establishing their correctness (or identifying their flaws).
It's much better to get newer and apparently better designs exposed to this level of scrutiny _before_ making them the only option in a new major release. That way you are much less likely to get hit by a showstopper edge case that no one anticipated.
