*
 */
@Deprecated
public interface ConflictResolver {
    String ROLE = ConflictResolver.class.getName();

    /**
     * Determines which of the specified versions of an artifact to use when there are conflicting declarations.
     *
     * @param node1 the first artifact declaration
     * @param node2 the second artifact declaration

{"item_id":3}
```

/// check | vérifier

Comme vous l'avez remarqué, la valeur reçue par la fonction (et renvoyée ensuite) est `3`,
en tant qu'entier (`int`) Python, pas la chaîne de caractères (`string`) `"3"`.

Grâce aux déclarations de types, **FastAPI** fournit du
<abbr title="conversion de la chaîne de caractères venant de la requête HTTP en données Python">"parsing"</abbr> automatique.

///

## Validation de données

 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public interface ModelNormalizer {

    /**
     * Merges duplicate elements like multiple declarations of the same build plugin in the specified model.
     *
     * @param model The model whose duplicate elements should be merged, must not be {@code null}.

Now that we have seen how to use `Path` and `Query`, let's see more advanced uses of request body declarations.

## Mix `Path`, `Query` and body parameters { #mix-path-query-and-body-parameters }

First, of course, you can mix `Path`, `Query` and request body parameter declarations freely and **FastAPI** will know what to do.

And you can also declare body parameters as optional, by setting the default to `None`:

        return getSinceStatus(properties, fallback)
    }

    private
    fun getSinceStatus(declarations: List<KtDeclaration>, fallback: String?): SinceTagStatus {
        val sinceTags = declarations.map { it.getSince() }
        return when {
            sinceTags.isEmpty() -> {
                fallback?.let { SinceTagStatus.Present(it) } ?: SinceTagStatus.Missing

  }

  @Override
  public @Nullable Object[] toArray() {
    return standardToArray();
  }

  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
  public <T extends @Nullable Object> T[] toArray(T[] array) {
    return standardToArray(array);
  }

  @Override
  public String toString() {
    return entrySet().toString();
  }

  }

  @Override
  public @Nullable Object[] toArray() {
    return standardToArray();
  }

  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
  public <T extends @Nullable Object> T[] toArray(T[] array) {
    return standardToArray(array);
  }

  @Override
  public String toString() {
    return entrySet().toString();
  }

          Object[] result = standardToArray();
          return result;
        }

        @Override
        @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
        public <T extends @Nullable Object> T[] toArray(T[] array) {
          return standardToArray(array);
        }
      };
    }

 *   <li><strong>Duplicate Dependencies</strong>: Removes duplicate dependency declarations that Maven 4 strictly validates</li>
 *   <li><strong>Duplicate Plugins</strong>: Removes duplicate plugin declarations that Maven 4 strictly validates</li>
 *   <li><strong>Unsupported Repository Expressions</strong>: Comments out repositories with expressions not supported by Maven 4</li>

You can use the same type declarations with `str`, `float`, `bool` and many other complex data types.

Several of these are explored in the next chapters of the tutorial.

## Order matters { #order-matters }