code: func TLSCerts(ca CertAuthority) [][]byte {
  	pairs := ca.GetTLSKeyPairs()
  	out := make([][]byte, len(pairs))
  	for i, pair := range pairs {
  		out[i] = append([]byte{}, pair.Cert...)
  	}
  	return out
  }
docs: // TLSCerts returns TLS certificates from CA