From 133c818635ebe552c079e38779ee45f55761be5c Mon Sep 17 00:00:00 2001
From: Taneli Hukkinen <3275109+hukkin@users.noreply.github.com>
Date: Mon, 28 Oct 2024 16:16:37 +0200
Subject: [PATCH] tomllib: Add a comment about implicit lru_cache bound

---
 Lib/tomllib/_re.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Lib/tomllib/_re.py b/Lib/tomllib/_re.py
index 994bb7493fd928..9eacefc729544e 100644
--- a/Lib/tomllib/_re.py
+++ b/Lib/tomllib/_re.py
@@ -84,6 +84,9 @@ def match_to_datetime(match: re.Match) -> datetime | date:
     return datetime(year, month, day, hour, minute, sec, micros, tzinfo=tz)
 
 
+# No need to limit cache size. This is only ever called on input
+# that matched RE_DATETIME, so there is an implicit bound of
+# 24 (hours) * 60 (minutes) * 2 (offset direction) = 2880.
 @lru_cache(maxsize=None)
 def cached_tz(hour_str: str, minute_str: str, sign_str: str) -> timezone:
     sign = 1 if sign_str == "+" else -1