解决 Django 自定义用户模型 Mypy 类型不兼容错误：字段重定义策略

from django.contrib.auth.models import AbstractUser
from django.db import models

class User(AbstractUser):
    # ... 其他自定义字段
    email = models.EmailField(db_index=True, blank=True, null=True, unique=True)
    # ...

error: Incompatible types in assignment (expression has type "EmailField[str | int | Combinable | None, str | None]", base class "AbstractUser" defined the type as "EmailField[str | int | Combinable, str]") [assignment]

from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin, BaseUserManager
from django.db import models
from django.utils import timezone

# 推荐定义一个自定义的用户管理器
class CustomUserManager(BaseUserManager):
    def create_user(self, email, password=None, **extra_fields):
        if not email:
            raise ValueError('The Email field must be set')
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, password=None, **extra_fields):
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)
        extra_fields.setdefault('is_active', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('Superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')

        return self.create_user(email, password, **extra_fields)

class User(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(db_index=True, blank=True, null=True, unique=True)
    first_name = models.CharField(max_length=150, blank=True)
    last_name = models.CharField(max_length=150, blank=True)
    is_staff = models.BooleanField(default=False)
    is_active = models.BooleanField(default=True)
    date_joined = models.DateTimeField(default=timezone.now)

    # 必须定义 USERNAME_FIELD，用于指定用户认证的唯一标识符
    USERNAME_FIELD = 'email'
    # 必须定义 REQUIRED_FIELDS，用于通过 createsuperuser 命令创建用户时需要输入的字段
    # 注意：USERNAME_FIELD 和 password 字段不应包含在此列表中
    REQUIRED_FIELDS = []

    # 关联自定义管理器
    objects = CustomUserManager()

    class Meta:
        verbose_name = 'user'
        verbose_name_plural = 'users'

    def __str__(self):
        return self.email

    def get_full_name(self):
        """
        Returns the first_name plus the last_name, with a space in between.
        """
        full_name = '%s %s' % (self.first_name, self.last_name)
        return full_name.strip()

    def get_short_name(self):
        """
        Returns the short name for the user.
        """
        return self.first_name