Podríamos hacerlo mejor.

Podemos declarar un modelo `UserBase` que sirva como base para nuestros otros modelos. Y luego podemos hacer subclases de ese modelo que heredan sus atributos (anotaciones de tipos, validación, etc).

Toda la conversión de datos, validación, documentación, etc. seguirá funcionando normalmente.

De esa manera, podemos declarar solo las diferencias entre los modelos (con `password` en texto plano, con `hashed_password` y sin contraseña):

En la especificación de OpenAPI se llama el <a href="https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#operation-object" class="external-link" target="_blank">Objeto de Operación</a>.

///

Tiene toda la información sobre la *path operation* y se usa para generar la documentación automática.

Incluye los `tags`, `parameters`, `requestBody`, `responses`, etc.

	// nopHeal is a no operating healing action to
	// wait for the current healing operation to finish
	nopHeal = ""
)

var (
	errHealIdleTimeout   = errors.New("healing results were not consumed for too long")
	errHealStopSignalled = errors.New("heal stop signaled")

	errFnHealFromAPIErr = func(ctx context.Context, err error) error {
		apiErr := toAdminAPIErr(ctx, err)
		return fmt.Errorf("Heal internal error: %s: %s",

	if len(args.Resources) > maxDeleteList {
		return false, fmt.Errorf("internal error: localLocker.Lock called with more than %d resources", maxDeleteList)
	}

	// If we have too many waiting, reject this at once.
	if l.waitMutex.Load() > lockMutexWaitLimit {
		l.locksOverloaded.Add(1)
		return false, nil
	}
	// Wait for mutex
	defer l.getMutex()()
	if ctx.Err() != nil {

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrSTSTooManyIntermediateCAs: {
		Code:           "TooManyIntermediateCAs",
		Description:    "The provided client certificate contains too many intermediate CA certificates",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrSTSNotInitialized: {
		Code:           "STSNotInitialized",
		Description:    "STS API not initialized, please try again.",

        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="StringLiteralEquality"/>
        <module name="UnnecessaryParentheses">
            <!-- defaults are too strict, see https://github.com/checkstyle/checkstyle/issues/10946 -->

* raise exception: вызвать исключение (also possible to use `сгенерировать исключение` or `выбросить исключение`)
* password flow: password flow (clarify as `аутентификация по паролю` if needed)
* tutorial: руководство (or `учебник`)
* too long; didn't read: слишком длинно; не читал
* proxy with a stripped path prefix: прокси с функцией удаления префикса пути
* nerd: умник
* sub application: подприложение
* webhook request: вебхук-запрос

				log("dsync: Refresh returned false for %#v at %s\n", args, c)
			}
		}(index, c)
	}

	// Wait until we have either
	//
	// a) received all refresh responses
	// b) received too many refreshed for quorum to be still possible
	// c) timed out
	//
	lockNotFound, lockRefreshed := 0, 0
	done := false

	for range len(restClnts) {
		select {
		case refreshResult := <-ch:

import (
	"bufio"
	"encoding/binary"
	"errors"
	"hash"
	"hash/crc32"
	"io"
	"io/fs"
	"strings"
	"unicode/utf8"
)

var (
	errLongName  = errors.New("zip: FileHeader.Name too long")
	errLongExtra = errors.New("zip: FileHeader.Extra too long")
)

// Writer implements a zip file writer.
type Writer struct {
	cw          *countWriter
	dir         []*header
	last        *fileWriter
	closed      bool

## Um aplicativo com callbacks { #an-app-with-callbacks }

Vamos ver tudo isso com um exemplo.

Imagine que você desenvolve um aplicativo que permite criar faturas.

Essas faturas terão um `id`, `title` (opcional), `customer` e `total`.