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in reply to Does hash contain minimum keys?

Maybe add a defined after the && if zero is a valid value? See also HASH COMPARISONS in Test::Deep .

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Cool Uses for Perl