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use strict;
use warnings;
...
say "@$_"
    for ( sort { $b->[1] <=> $a->[1] } @sizes )[ 0..19 ];

use strict;
use warnings;
...
say "@$_[ 1, 0 ]"
    for ( sort { $b->[0] <=> $a->[0] } @sizes )[ 0 .. 19 ];

max_workers => 1
  collatz_vr         3.617s    1.0x
...
  collatz_count_c1   0.112s    6.6x  Inline C
  collatz_count_c2   0.108s    5.8x  Inline C