return bufferIndex - start;
    }

    @Override
    public String toString() {
        return ("NetShareEnumResponse[" + super.toString() + ",status=" + getStatus() + ",converter=" + this.converter + ",entriesReturned="
                + getNumEntries() + ",totalAvailableEntries=" + this.totalAvailableEntries + "]");
    }

 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import org.codelibs.core.beans.Converter;

/**
 * Exception thrown when an error occurs in a {@link Converter}.
 *
 * @author higa
 */
public class ConverterRuntimeException extends ClRuntimeException {

    private static final long serialVersionUID = 1L;

    /**

        return bufferIndex - start;
    }

    @Override
    public String toString() {
        return ("NetServerEnum2Response[" + super.toString() + ",status=" + status + ",converter=" + converter + ",entriesReturned="
                + numEntries + ",totalAvailableEntries=" + totalAvailableEntries + ",lastName=" + lastName + "]");
    }

  public void testConverterToForward() {
    assertThat(UPPER_UNDERSCORE.converterTo(UPPER_CAMEL).convert("FOO_BAR")).isEqualTo("FooBar");
    assertThat(UPPER_UNDERSCORE.converterTo(LOWER_CAMEL).convert("FOO_BAR")).isEqualTo("fooBar");
    assertThat(UPPER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("FooBar")).isEqualTo("FOO_BAR");
    assertThat(LOWER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("fooBar")).isEqualTo("FOO_BAR");
  }

import static org.junit.Assert.assertThat;

import java.sql.Time;
import java.sql.Timestamp;
import java.util.Date;

import org.codelibs.core.beans.converter.DateConverter;
import org.codelibs.core.beans.converter.NumberConverter;
import org.codelibs.core.exception.ConverterRuntimeException;
import org.junit.Test;

/**
 * @author higa
 */
public class CopyOptionsTest {

    /**

    }

    /**
     * Converts the given object to a {@link Date}.
     *
     * @param src
     *            The source object to convert.
     * @return The converted {@link Date}.
     */
    public static Date toDate(final Object src) {
        return toDate(src, null, LocaleUtil.getDefault());
    }

    /**
     * Converts the given object to a {@link Date}.
     *

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.

    }

    /**
     * Converts the given object to a {@link Date}.
     *
     * @param src
     *            The source object to convert.
     * @return The converted {@link Date}.
     */
    public static Date toDate(final Object src) {
        return toDate(src, null, LocaleUtil.getDefault());
    }

    /**
     * Converts the given object to a {@link Date}.
     *

     * @return the converted {@link Date}
     */
    public static Date toDate(final Object src, final String pattern) {
        return toDate(src, pattern, LocaleUtil.getDefault());
    }

    /**
     * Converts an object to {@link Date}.
     *
     * @param src the source object
     * @param locale the locale (must not be {@literal null})
     * @return the converted {@link Date}
     */

     */
    protected IntegerConversionUtil() {
    }

    /**
     * Converts to {@link Integer}.
     *
     * @param o
     *            The object to convert
     * @return The converted {@link Integer}
     */
    public static Integer toInteger(final Object o) {
        return toInteger(o, null);
    }

    /**
     * Converts to {@link Integer}.
     *
     * @param o
     *            The object to convert