Do not push to array asynchronously
Do not push to array asynchronously

It was clear right from the start that doing so is stupid, but turns out it
causes actual segfaults (RT #128870).

There is a chance that this was the reason behind some of the segfaults
observed during the testing of Perl 6 bots. We will see.

perl6/whateverable,perl6/whateverable,perl6/whateverable,MasterDuke17/whateverable