chore: switch to functools.cached_property for intensive code

Author: RiccardoVaccari

discord/onboarding.py

@@ -25,6 +25,7 @@
 from __future__ import annotations
 
 from typing import TYPE_CHECKING, Any
+from functools import cached_property
 
 from .enums import OnboardingMode, PromptType, try_enum
 from .partial_emoji import PartialEmoji
@@ -247,7 +248,7 @@ def _update(self, data: OnboardingPayload):
         self.enabled: bool = data["enabled"]
         self.mode: OnboardingMode = try_enum(OnboardingMode, data.get("mode"))
 
-    @property
+    @cached_property
     def default_channels(
         self,
     ) -> list[TextChannel | ForumChannel | VoiceChannel | Object]:

discord/poll.py

@@ -26,6 +26,7 @@
 
 import datetime
 from typing import TYPE_CHECKING, Any
+from functools import cached_property
 
 from . import utils
 from .enums import PollLayoutType, try_enum
@@ -358,7 +359,7 @@ def __init__(
         self._expiry = None
         self._message = None
 
-    @property
+    @cached_property
     def expiry(self) -> datetime.datetime | None:
         """An aware datetime object that specifies the date and time in UTC when the poll will end."""
         return utils.parse_time(self._expiry)