From 67f5c5bd6fcc956a785edef3be67e8cbe470cd31 Mon Sep 17 00:00:00 2001
From: Taneli Hukkinen <3275109+hukkin@users.noreply.github.com>
Date: Tue, 29 Oct 2024 12:36:14 +0200
Subject: tomllib: Add a comment about implicit lru_cache bound (GH-126078)

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

diff --git a/Lib/tomllib/_re.py b/Lib/tomllib/_re.py
index 994bb74..9eacefc 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
-- 
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