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

[via Digitalmars-d-bugs]

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

--- Comment #3 from Ketmar Dark <ket...@ketmar.no-ip.org> ---
p.s. i created this ER in the hope that people will talk about API too: i'm
usually sux at inventig APIs.

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