From bf6cabc8049cbdf4d0b8af33134317a0190a614f Mon Sep 17 00:00:00 2001
From: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Date: Wed, 27 Dec 2023 22:24:57 -0800
Subject: [PATCH] Do not round cache mtimes (#4128)

Fixes #4116

This logic was introduced in #3821, I believe as a result of copying
logic inside mypy that I think isn't relevant to Black
---
 CHANGES.md         | 2 ++
 src/black/cache.py | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGES.md b/CHANGES.md
index 1444463050f..2389f6d39fd 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -21,6 +21,8 @@
 
 <!-- Changes to how Black can be configured -->
 
+- Fix cache mtime logic that resulted in false positive cache hits (#4128)
+
 ### Packaging
 
 <!-- Changes to how Black is packaged, such as dependency requirements -->
diff --git a/src/black/cache.py b/src/black/cache.py
index c844c37b6f8..cfdbc21e92a 100644
--- a/src/black/cache.py
+++ b/src/black/cache.py
@@ -101,7 +101,7 @@ def is_changed(self, source: Path) -> bool:
         st = res_src.stat()
         if st.st_size != old.st_size:
             return True
-        if int(st.st_mtime) != int(old.st_mtime):
+        if st.st_mtime != old.st_mtime:
             new_hash = Cache.hash_digest(res_src)
             if new_hash != old.hash:
                 return True