Rework Role.edit to not rely on previous role state

discord/role.py

@@ -23,7 +23,7 @@ DEALINGS IN THE SOFTWARE.
 """
 
 from __future__ import annotations
-from typing import Any, List, Optional, TypeVar, Union, overload, TYPE_CHECKING
+from typing import Any, Dict, List, Optional, TypeVar, Union, overload, TYPE_CHECKING
 
 from .permissions import Permissions
 from .errors import InvalidArgument
@@ -339,25 +339,18 @@ class Role(Hashable):
         payload = [{"id": z[0], "position": z[1]} for z in zip(roles, change_range)]
         await http.move_role_position(self.guild.id, payload, reason=reason)
 
-    @overload
     async def edit(
         self,
         *,
-        reason: Optional[str] = ...,
-        name: str = ...,
-        permissions: Permissions = ...,
-        colour: Union[Colour, int] = ...,
-        hoist: bool = ...,
-        mentionable: bool = ...,
-        position: int = ...,
+        name: str = MISSING,
+        permissions: Permissions = MISSING,
+        colour: Union[Colour, int] = MISSING,
+        color: Union[Colour, int] = MISSING,
+        hoist: bool = MISSING,
+        mentionable: bool = MISSING,
+        position: int = MISSING,
+        reason: Optional[str] = MISSING,
     ) -> None:
-        ...
-
-    @overload
-    async def edit(self) -> None:
-        ...
-
-    async def edit(self, *, reason=None, **fields) -> None:
         """|coro|
 
         Edits the role.
@@ -399,26 +392,31 @@ class Role(Hashable):
             role was asked to be moved.
         """
 
-        position = fields.get('position')
-        if position is not None:
+        if position is not MISSING:
             await self._move(position, reason=reason)
             self.position = position
 
-        try:
-            colour = fields['colour']
-        except KeyError:
-            colour = fields.get('color', self.colour)
+        payload: Dict[str, Any] = {}
+        if color is not MISSING:
+            colour = color
 
-        if isinstance(colour, int):
-            colour = Colour(value=colour)
+        if colour is not MISSING:
+            if isinstance(colour, int):
+                payload['color'] = colour
+            else:
+                payload['color'] = colour.value
 
-        payload = {
-            'name': fields.get('name', self.name),
-            'permissions': str(fields.get('permissions', self.permissions).value),
-            'color': colour.value,
-            'hoist': fields.get('hoist', self.hoist),
-            'mentionable': fields.get('mentionable', self.mentionable),
-        }
+        if name is not MISSING:
+            payload['name'] = name
+
+        if permissions is not MISSING:
+            payload['permissions'] = permissions.value
+
+        if hoist is not MISSING:
+            payload['hoist'] = hoist
+
+        if mentionable is not MISSING:
+            payload['mentionable'] = mentionable
 
         data = await self._state.http.edit_role(self.guild.id, self.id, reason=reason, **payload)
         self._update(data)