Perf regression

gistfile1.txt

use v6;

my Int @cache is default(0);
my $sum89 = 0;

for (1..567) -> $i {
  @cache[$i] = calc-chain($i);
}

for (1..400_000) -> $i {
  $sum89++ if @cache[get-sq-sum($i)] == 89;
}

#say $sum89;
say now - INIT now;

sub calc-chain($n) {
  my $sq-sum = get-sq-sum($n);
  $sq-sum != 1|89 ?? calc-chain($sq-sum) !! $sq-sum;
}

sub get-sq-sum(int $i is copy) {
  my $sum = 0;
  while $i > 0 {
    $sum += ($i % 10) ** 2;
    $i = $i div 10;
  }
  $sum;
}