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{
my @values;
...
    sum(@values) / @values;
}
}

        Rate  orig  zaxo   buk  aris cache
orig  6.26/s    --  -22%  -42%  -80%  -98%
...
buk   10.9/s   74%   36%    --  -66%  -97%
aris  31.8/s  408%  297%  192%    --  -91%
cache  368/s 5775% 4496% 3283% 1057%    --

{
my %cache;
...
    return $timebase + $sec + $min*60 + $hour*60*60;
}
}

      s/iter  D::P buggy fixed nonre cache
D::P    9.08    --  -76%  -77%  -77%  -92%
...
fixed   2.12  328%    2%    --   -2%  -65%
nonre   2.09  335%    4%    2%    --  -65%
cache  0.735 1136%  194%  188%  184%    --