Então, mesmo com o código acima que não usa Pydantic explicitamente, o FastAPI está usando Pydantic para converter essas dataclasses padrão para a versão do Pydantic.

E claro, ele suporta o mesmo:

* validação de dados
* serialização de dados
* documentação de dados, etc.

  }

  /**
   * Returns a serializable {@code Converter} that converts strings from this format to {@code
   * targetFormat}.
   *
   * @since 16.0
   */
  public Converter<String, String> converterTo(CaseFormat targetFormat) {
    return new StringConverter(this, targetFormat);
  }

  private static final class StringConverter extends Converter<String, String>
      implements Serializable {

        "the total number of elements (%s) in the arrays must fit in an int",
        result);
    return (int) result;
  }

  private static final class FloatConverter extends Converter<String, Float>
      implements Serializable {
    static final Converter<String, Float> INSTANCE = new FloatConverter();

    @Override
    protected Float doForward(String value) {
      return Float.valueOf(value);
    }

    @Override

## Converter qualquer dado para compatível com JSON { #convert-any-data-to-json-compatible }

Para converter qualquer dado para um formato compatível com JSON, leia a seção [Tutorial - Codificador Compatível com JSON](../tutorial/encoder.md){.internal-link target=_blank}.

    } else if (accum == Long.MIN_VALUE) {
      return null;
    } else {
      return -accum;
    }
  }

  private static final class LongConverter extends Converter<String, Long> implements Serializable {
    static final Converter<String, Long> INSTANCE = new LongConverter();

    @Override
    protected Long doForward(String value) {
      return Long.decode(value);
    }

    @Override

  public static short fromBytes(byte b1, byte b2) {
    return (short) ((b1 << 8) | (b2 & 0xFF));
  }

  private static final class ShortConverter extends Converter<String, Short>
      implements Serializable {
    static final Converter<String, Short> INSTANCE = new ShortConverter();

    @Override
    protected Short doForward(String value) {
      return Short.decode(value);
    }

    @Override

  public static short fromBytes(byte b1, byte b2) {
    return (short) ((b1 << 8) | (b2 & 0xFF));
  }

  private static final class ShortConverter extends Converter<String, Short>
      implements Serializable {
    static final Converter<String, Short> INSTANCE = new ShortConverter();

    @Override
    protected Short doForward(String value) {
      return Short.decode(value);
    }

    @Override

        "the total number of elements (%s) in the arrays must fit in an int",
        result);
    return (int) result;
  }

  private static final class DoubleConverter extends Converter<String, Double>
      implements Serializable {
    static final Converter<String, Double> INSTANCE = new DoubleConverter();

    @Override
    protected Double doForward(String value) {
      return Double.valueOf(value);
    }

conscrypt-android = { module = "org.conscrypt:conscrypt-android", version.ref = "org-conscrypt" }
conscrypt-openjdk = { module = "org.conscrypt:conscrypt-openjdk-uber", version.ref = "org-conscrypt" }
converter-moshi = { module = "com.squareup.retrofit2:converter-moshi", version.ref = "retrofit" }
eclipseOsgi = "org.eclipse.platform:org.eclipse.osgi:3.23.200"
gradlePlugin-android = { module = "com.android.tools.build:gradle", version.ref = "agp" }

}

dependencies {
  implementation(projects.okhttp)
  implementation(projects.okhttpCoroutines)
  implementation(libs.conscrypt.openjdk)

  implementation(libs.retrofit)
  implementation(libs.converter.moshi)
  implementation(libs.squareup.moshi)
  implementation(libs.squareup.moshi.kotlin)

  ksp(libs.squareup.moshi.compiler)
}

tasks.compileJava {
  options.isWarnings = false