How can I clean array and prevent further reallocation if there's enough space already?

[Adam D. Ruppe]

On Sunday, 7 February 2021 at 21:31:11 UTC, Jack wrote:
> assumeSafeAppend() wouldn't work in this case because I don't 
> know the number of items that is going to be added to the array.

I don't think that matters. assumeSafeAppend seems appropriate 
for your need.