Lo mismo sucedería si tuvieras algo como un <abbr title='Una unión entre múltiples tipos significa "cualquiera de estos tipos".'>union</abbr> entre diferentes tipos donde uno o más de ellos no son tipos válidos de Pydantic, por ejemplo esto fallaría 💥:

{* ../../docs_src/response_model/tutorial003_04_py310.py hl[8] *}

        <state type="buildPinned" enabled="false" />
        <state type="buildUnpinned" enabled="false" />
      </states>
      <build-types enabled-for-all="false" enabled-for-subprojects="false">
        <build-type id="bt270451" />
      </build-types>
    </webhook>
    <webhook url="https://gradle-bot.grdev.net/teamcity" enabled="true" template="legacy-tailored-json">
      <states>

    /**
     * Returns all methods that are applicable to actual argument types.
     *
     * @param methods list of all candidate methods
     * @param classes the actual types of the arguments
     * @return a list that contains only applicable methods (number of
     *         formal and actual arguments matches, and argument types are assignable
     *         to formal types through a method invocation conversion).
     */

# Copy from Pydantic v2, compatible with v1
if sys.version_info < (3, 10):
    WithArgsTypes: tuple[Any, ...] = (typing._GenericAlias, types.GenericAlias)  # type: ignore[attr-defined]
else:
    WithArgsTypes: tuple[Any, ...] = (
        typing._GenericAlias,  # type: ignore[attr-defined]
        types.GenericAlias,
        types.UnionType,
    )  # pyright: ignore[reportAttributeAccessIssue]

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public Collection<Type> provides() {
        return (Collection) types();
    }

    public Collection<DefaultType> types() {
        return Arrays.asList(
                // Maven types
                new DefaultType(Type.POM, Language.NONE, "pom", null, false),
                new DefaultType(Type.BOM, Language.NONE, "pom", null, false),

     *            The type of the Bean
     * @return The constructor
     */
    <T> Constructor<T> getConstructor();

    /**
     * Returns an array of the parameter types of the constructor.
     *
     * @return An array of the parameter types of the constructor
     */
    Class<?>[] getParameterTypes();

    /**
     * Returns {@literal true} if the constructor is {@literal public}.
     *

  dependencies:
    "@types/node" "*"

"@types/eslint-scope@^3.7.3":
  version "3.7.4"
  resolved "https://registry.yarnpkg.com/@types/eslint-scope/-/eslint-scope-3.7.4.tgz#37fc1223f0786c39627068a12e94d6e6fc61de16"
  integrity sha512-9K4zoImiZc3HlIp6AVUDE4CWYx22a+lhSZMYNpbjW04+YF0KWj4pJXnEMjdnFTiQibFFmElcsasJXDbdI/EPhA==
  dependencies:
    "@types/eslint" "*"
    "@types/estree" "*"

"@types/eslint@*":

     */
    private final Class<?> targetClass;

    /**
     * The parameter types.
     */
    private final Class<?>[] argTypes;

    /**
     * Creates a {@link NoSuchConstructorRuntimeException}.
     *
     * @param targetClass
     *            Target class
     * @param argTypes
     *            Array of parameter types
     * @param cause
     *            The cause of the exception
     */

Given these constraints, we cannot always follow best practices.  This ADR proposes the way we should handle the use of Provider APIs in the gradle/gradle codebase.

## Decision

### Types of properties that should not use lazy types

...e declare o seu tipo como o modelo que você criou, `Item`.

## Resultados { #results }

Apenas com essa declaração de tipos do Python, o **FastAPI** irá:

* Ler o corpo da requisição como um JSON.
* Converter os tipos correspondentes (se necessário).
* Validar os dados.
    * Se algum dado for inválido, irá retornar um erro bem claro, indicando exatamente onde e o que estava incorreto.