code: function addScrubber(scrubber, element, expr) {
        let safeExpr = null;
        if (!isWellFormed(expr)) {
          expr = '{/*Malformed Expression*/}';
        }
        needsScrubber = true;
        safeExpr = ` sc_${ unpredictableSuffix }.${ scrubber }(${ stringify(element || '*') }, ${ expr }) `;
        return safeExpr;
      }
docs: Decorate expression text with a call to a scrubber function that checks an entire attribute bundle at runtime.