strangely, the simple push won!
No need to be so surprised. In both your and my benchmark, the
difference between "push", "assign" and
"assignpre" is small, less than 10%. Speed rate differences
as reported by Benchmark can differ drasticly not only between versions
of Perl, but only if the underlaying OS differs, or the compiler used
to compile Perl (even different versions of the same compiler!).
That is, a benchmark can give different "winners" for the same test
if the OS, Perl version or compiler differs.
Abigail
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