1nickt++, thank you. Regarding MCE::Shared and when the condition var aspect is not needed, the shared scalar will do the same.

my $shared = MCE::Shared->scalar(0);
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Workers fetch and increment accordingly.

$shared->get;
$shared->incr;
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As of this writing, MCE and MCE::Shared are at 1.827 and 1.823 respectively.