code: func CopyMap(m map[string]string) map[string]string {
  	if m == nil {
  		return nil
  	}
  	r := map[string]string{}
  	for k, v := range m {
  		r[k] = v
  	}
  	return r
  }
docs: // CopyMap creates an exact copy of the provided string-to-string map