I used to be able to add a filter in PolymerExpression doing
PolymerExpressions.filters.upObject = function() {
    return {
      toDOM: function(value) {
        var parts = [];
        console.log("I see value", value);
        for (var key in value) {

          parts.push(dict[key].toUpperCase())
        }
        return parts.join('; ');
      }
    };
  };

It does not seem possible anymore, as PolymerExpressions.filters does not 
seem reachable anymore. Is there another way ?  It did sound to me as a 
nice feature to be able to create your own filters. 

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