Any bareword found inside {...} is taken as a single-quoted string. You must make shift not a bareword.

$conf{+shift}
$conf{shift()}
$conf{shift @_}
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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;