docs: function slice() {
    /*jshint validthis:true */
    var self = (this instanceof QueryBuilder) ? this : new QueryBuilder();
  
    var args = mlutil.asArray.apply(null, arguments);
  
    // TODO: if empty, clear the clause
  
    self.sliceClause = mlutil.makeSliceClause('query', args);
  
    return self;
  }