code: func (r Record) GetSlice(column string) ([]interface{}, error) {
  	v, err := r.getKey(reflect.Slice, column)
  	if err != nil {
  		return nil, err
  	}
  
  	rv := reflect.ValueOf(v)
  	n := rv.Len()
  	out := make([]interface{}, n)
  
  	for i := 0; i < n; i++ {
  		out[i] = rv.Index(i).Interface()
  	}
  
  	return out, nil
  }
docs: // GetSlice returns a slice of interface value for a specific column.