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#!/usr/bin/perl
use strict;
...
        ref($x) and warnings::warnif("Argument list contains reference
+s/objects");
        return "$x" }
}

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  OnlyAString: 111
ICanStringify: 222
Package OnlyANumber doesn't overload stringification: Operation """": 
+no method found, argument in overloaded package OnlyANumber at ...