How to find the right function in the Phobos library?

[Bruce]

On Saturday, 17 August 2024 at 05:42:42 UTC, monkyyy wrote:
> On Saturday, 17 August 2024 at 05:28:37 UTC, Bruce wrote:
>
> It's the correct name for the wrong function

Are you saying this is wrong?
auto i = arr.countUntil("ha");