Actually the current spec allows something along these lines: 
sub my_context_sensitive {
    return $someobject but {
         method Str {
              # code for computing the string representation
         }
         method list {
              # code that's called in list context
         }
         ...
    }
}

[download]

So the cost of that is just creating a closure for each "overloaded" context.

In reply to Re^3: Contexts and Perl 6 by moritz
in thread Contexts and Perl 6 by John M. Dlugosz

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