this.slice(0, length - truncation.length) + truncation : this; 
this.slice(0, length - truncation.length) + truncation : String(this); 
  truncate: function(length, truncation) {    length = length || 30;    truncation = truncation === undefined ? '...' : truncation;    return this.length > length ?      this.slice(0, length - truncation.length) + truncation : this;  },
4053	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4053/37a06e5ed1bdb861348bb0cfd02f71470a0dfdfb/prototype.js/clean/lib/prototype.js