in reply to
Why will referencing an undefined value as array reference create a real array
See Explaining Autovivication and Autovivification in perl, those posts also have more links in them.
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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