code: function _trimBreadcrumbs(breadcrumbs) {
  	    // known breadcrumb properties with urls
  	    // TODO: also consider arbitrary prop values that start with (https?)?://
  	    var urlProps = ['to', 'from', 'url'],
  	        urlProp,
  	        crumb,
  	        data;
  
  	    for (var i = 0; i < breadcrumbs.values.length; ++i) {
  	      crumb = breadcrumbs.values[i];
  	      if (!crumb.hasOwnProperty('data') || !isObject$1(crumb.data) || objectFrozen$1(crumb.data)) continue;
  	      data = objectMerge$1({}, crumb.data);
  
  	      for (var j = 0; j < urlProps.length; ++j) {
  	        urlProp = urlProps[j];
  
  	        if (data.hasOwnProperty(urlProp) && data[urlProp]) {
  	          data[urlProp] = truncate$1(data[urlProp], this._globalOptions.maxUrlLength);
  	        }
  	      }
  
  	      breadcrumbs.values[i].data = data;
  	    }
  	  }
docs: Truncate breadcrumb values (right now just URLs)