in reply to Using "negative" characters with the range operator.
If the final value specified is not in the sequence that the magical increment would produce, the sequence goes until the next value would be longer than the final value specified.
-'a' is the same as '-a' (see Unary "-" under Symbolic Unary Operators in perlop again) which for the range operator is the same as '*a', '%a', '^a' etc.
($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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