Applying my same tricks, you can replace the @_=();say@_ initialization by @_=!say@_, which is two chars shorter,yielding 31 on Windows and 33 on Unix:

-nE@_[ord]=$_,for/./g;@_=!say@_

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In reply to Re^2: Collapsing a string to unique characters by Corion
in thread Collapsing a string to unique characters by dwhite20899

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