Your output of perldoc is missing
This keyword is available only when the "fc" feature is enabled, or when prefixed with "CORE::"; See feature. Alternately, include a "use v5.16" or later to the current scope.

and therefore, your oneliners are missing 

-Mfeature=fc

[download]

This would output 0 on the problematic line. To get 1, you need to also add unicode_strings (or just change -e to -E to get both in recent Perls).

($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,

[download]

In reply to Re: unicode lc uc fc wtf by choroba
in thread unicode lc uc fc wtf by Anonymous Monk

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