Sweet!
Why do you flatten the array? I played with that in Pugs and the asterisk seems superfluous. It seems like one is copy the elements and the other is copying the array. I thought that maybe your version would avoid aliasing problems, but even in checking that, I'm not seeing it happening.
sub group (@array is copy) { # didn't flatten
gather {
while @array {
take [
gather {
my $h = shift @array;
take $h;
while @array and $h eq @array[0] {
take shift @array;
}
}
];
}
}
}
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