AFAIK, only true, false and undef. I thought perhaps "0 but true" might work (as that has special handling - it doesn't warn if used in numeric context) but no joy.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^2: Perl allows you to change the definition of false to make it true. (And vice versa.) by tobyink
in thread Perl allows you to change the definition of false to make it true. (And vice versa.) by tobyink

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