in reply to
How do you clone a data structure?
Data::Clone is the speed king, as of today (see its benchmark dir). It looks great.
Clone::Fast is development since Clone.
Data::COW's idea is interesting.
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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