}

    public static List<RemoteRepository> toRepos(List<ArtifactRepository> repos) {
        return Optional.ofNullable(repos).orElse(Collections.emptyList()).stream()
                .map(RepositoryUtils::toRepo)
                .collect(Collectors.toList());
    }

    public static RemoteRepository toRepo(ArtifactRepository repo) {
        RemoteRepository result = null;

            InternalSession iSession = new SimpleSession(mSession, repoSystem, null);
            InternalSession.associate(repoSession, iSession);

            List<RemoteRepository> repositories = RepositoryUtils.toRepos(request.getPluginArtifactRepositories());
            UnaryOperator<String> interpolator = createInterpolator(request);

            InternalSession iSession = new SimpleSession(mSession, repoSystem, null);
            InternalSession.associate(repoSession, iSession);

            List<RemoteRepository> repositories = RepositoryUtils.toRepos(request.getPluginArtifactRepositories());
            UnaryOperator<String> interpolator = createInterpolator(request);

                ArtifactRequest artifactRequest = new ArtifactRequest();
                artifactRequest.setArtifact(RepositoryUtils.toArtifact(artifact));
                artifactRequest.setRepositories(RepositoryUtils.toRepos(remoteRepositories));

                // Maven 2.x quirk: an artifact always points at the local repo, regardless whether resolved or not
                LocalRepositoryManager lrm = session.getLocalRepositoryManager();

    public void setRemoteArtifactRepositories(List<ArtifactRepository> remoteArtifactRepositories) {
        this.remoteArtifactRepositories = remoteArtifactRepositories;
        this.remoteProjectRepositories = RepositoryUtils.toRepos(getRemoteArtifactRepositories());
    }

    @Deprecated
    public List<ArtifactRepository> getRemoteArtifactRepositories() {
        if (remoteArtifactRepositories == null) {

            org.eclipse.aether.repository.MirrorSelector selector = session.getMirrorSelector();
            if (selector != null) {
                RemoteRepository repo = selector.getMirror(RepositoryUtils.toRepo(repository));
                if (repo != null) {
                    Mirror mirror = new Mirror();
                    mirror.setId(repo.getId());
                    mirror.setUrl(repo.getUrl());

                // eaten, handled by repo system
            } else {
                request.addMetadata(new MetadataBridge(metadata));
            }
        }

        RemoteRepository remoteRepo = RepositoryUtils.toRepo(deploymentRepository);
        /*
         * NOTE: This provides backward-compat with maven-deploy-plugin:2.4 which bypasses the repository factory when
         * using an alternative deployment location.
         */

                repositorySystem,
                remoteRepositories,
                remoteRepositories == null
                        ? map(session.getRequest().getRemoteRepositories(), RepositoryUtils::toRepo)
                        : null,
                lookup);
        this.mavenSession = session;
        this.mavenRepositorySystem = mavenRepositorySystem;
        this.runtimeInformation = runtimeInformation;
    }

                        .session(session)
                        .repositories(repositories.stream()
                                .map(RepositoryUtils::toRepo)
                                .map(session::getRemoteRepository)
                                .toList())
                        .coordinates(List.of(coordinates))
                        .build();

Creo que `Union[SomeType, None]` es más explícito sobre lo que significa.

Se trata solo de las palabras y nombres. Pero esas palabras pueden afectar cómo tú y tus compañeros de equipo piensan sobre el código.

Como ejemplo, tomemos esta función:

{* ../../docs_src/python_types/tutorial009c_py39.py hl[1,4] *}

El parámetro `name` está definido como `Optional[str]`, pero **no es opcional**, no puedes llamar a la función sin el parámetro: