@type t() :: %ExSwan.RegistrationResult{
  aaguid: String.t(),
  attestation_format: atom(),
  authenticator_attachment: String.t() | nil,
  authenticator_extension_results: map(),
  client_extension_results: map(),
  credential: ExSwan.Credential.t(),
  credential_backed_up: boolean(),
  credential_device_type: :single_device | :multi_device,
  origin: String.t(),
  rp_id: String.t(),
  user_verified: boolean()
}