This is nothing a little conditional can't cure. From a syntax standpoint, \N is the right symbol to use since \n means "newline" and we have the practice of saying \w|\W and \s|\S. I would think you'd either want to shuffle off the unicode name or just not do the work.

sub import {
    if ( $] >= 5.010 ) {
        # Thanks to demerphq, this is native and the overloading isn't
+ needed.
    }
    else {
        overload::constant qr => \ &convert;
    }
}
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