On my machine at least, fib6 is 4% faster than fib5:
my @fib6_cache;
sub fib6 {
my $n = shift;
$fib6_cache[ $n ] //= $n < 2 ? $n
: ( $fib6_cache[ $n-1 ] //= fib6($n-1) )
+ ( $fib6_cache[ $n-2 ] //= fib6($n-2) );
}
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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