Use a specific tag type for member and user comparisons

The previous protocol based tag type caused significant overhead
(in the magnitude of seconds). Removing this should simplify object
creation by removing typing.Generic from the __mro__

discord/member.py

@@ -35,7 +35,7 @@ import discord.abc
 
 from . import utils
 from .utils import MISSING
-from .user import BaseUser, User
+from .user import BaseUser, User, _UserTag
 from .activity import create_activity, ActivityTypes
 from .permissions import Permissions
 from .enums import Status, try_enum
@@ -194,13 +194,11 @@ def flatten_user(cls):
     return cls
 
 
-_BaseUser = discord.abc.User
-
 M = TypeVar('M', bound='Member')
 
 
 @flatten_user
-class Member(discord.abc.Messageable, _BaseUser):
+class Member(discord.abc.Messageable, _UserTag):
     """Represents a Discord member to a :class:`Guild`.
 
     This implements a lot of the functionality of :class:`User`.
@@ -301,7 +299,7 @@ class Member(discord.abc.Messageable, _BaseUser):
         )
 
     def __eq__(self, other: Any) -> bool:
-        return isinstance(other, _BaseUser) and other.id == self.id
+        return isinstance(other, _UserTag) and other.id == self.id
 
     def __ne__(self, other: Any) -> bool:
         return not self.__eq__(other)

discord/user.py

@@ -35,10 +35,13 @@ __all__ = (
     'ClientUser',
 )
 
-_BaseUser = discord.abc.User
+
+class _UserTag:
+    __slots__ = ()
+    id: int
 
 
-class BaseUser(_BaseUser):
+class BaseUser(_UserTag):
     __slots__ = ('name', 'id', 'discriminator', '_avatar', 'bot', 'system', '_public_flags', '_state')
 
     if TYPE_CHECKING:
@@ -62,7 +65,7 @@ class BaseUser(_BaseUser):
         return f'{self.name}#{self.discriminator}'
 
     def __eq__(self, other):
-        return isinstance(other, _BaseUser) and other.id == self.id
+        return isinstance(other, _UserTag) and other.id == self.id
 
     def __ne__(self, other):
         return not self.__eq__(other)
@@ -118,6 +121,7 @@ class BaseUser(_BaseUser):
             return Asset._from_default_avatar(self._state, int(self.discriminator) % len(DefaultAvatar))
         else:
             return Asset._from_avatar(self._state, self.id, self._avatar)
+
     @property
     def default_avatar(self):
         """:class:`Asset`: Returns the default avatar for a given user. This is calculated by the user's discriminator."""