code: func IsFatal(e error) bool {
  	if e == nil {
  		return false
  	}
  	switch errStatus(e) {
  	case KEY_ENOENT, KEY_EEXISTS, NOT_STORED, TMPFAIL:
  		return false
  	}
  	return true
  }
docs: // False if this error isn't believed to be fatal to a connection.