Can someone explain why FETCH is called *EIGHT* times ???

Proxy huh????

class A is Hash {
    method at_key(A:D $hash: $k) {
        Proxy.new(
          FETCH => {
say "in FETCH with $k";
              $hash.exists_key($k) ?? $hash{$k} !! Int;
          },
          STORE => -> $old, $new {
            if $new > 0 {
                $hash{$k} = $new;
                $new;
            }
            elsif $new == 0 {
                $hash.delete_key($k);
                $new;
            }
            else { # we don't know about negative values
                Int;
            }
          }
        );
    }
}

my $a = A.new;
say $a<b>++;
========================================
in FETCH with b
in FETCH with b
in FETCH with b
in FETCH with b
in FETCH with b
in FETCH with b
in FETCH with b
in FETCH with b
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