I should point out that the line:
my $live = sum(@.grid[$^x-1..$^x+1][$^y-1..$^y+1]);
is somewhat speculative. It's not clear to me how multidimensional slices will interact with flattening contexts (such as the argument list of the standard &sum function).
It might be that that line needs to be:
my $live = sum(map {sum .[$^y-1..$^y+1]} @.grid[$^x-1..$^x+1]);
Though, given how ugly that is, I'd naturally prefer sum to be smart enough to flatten multidimensional slices.
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