if r == nil || other == nil {
		return r == other
	}
	var o RemoteErr
	if errors.As(other, &o) {
		return r == &o
	}
	return false
}

// IsRemoteErr returns the value if the error is a RemoteErr.
func IsRemoteErr(err error) *RemoteErr {
	var r RemoteErr
	if errors.As(err, &r) {
		return &r
	}
	return nil
}

type (
	// SingleHandlerFn is handlers for one to one requests.