in reply to Use a Serialized Hash... When It Might Not Exist?

-1 is a true value. Use 0, "", or undef for false.

In fact, why not replace 

if(DoIHaveThisData($hashref, 'key2')){

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with

if (exists $hashref->{key2}) {

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?

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In Section Seekers of Perl Wisdom