[Issue 16269] add `aa.ensureAllocated` method to associative array to clear and initialize it

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16269

--- Comment #8 from Ketmar Dark <ketmar at ketmar.no-ip.org> ---
>I get a chance, I'll make a PR
thank you.

>I will check for null pointer in wrapper rather than the runtime code to avoid extra
>opaque calls.
yes, this is way better, tnx again. i planned to do exactly that, but somehow
put it in the wrong place. ;-)

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