From d24394fa2fc92eb98ab5914c370760480604d5e1 Mon Sep 17 00:00:00 2001
From: Semyon Moroz <donbarbos@proton.me>
Date: Fri, 8 Aug 2025 09:03:27 +0000
Subject: [PATCH] [zlib] Add `ZLIBNG_VERSION` (#14513)

Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
---
 stdlib/@tests/stubtest_allowlists/win32-py314.txt |  8 --------
 stdlib/zlib.pyi                                   | 12 ++++++++----
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/stdlib/@tests/stubtest_allowlists/win32-py314.txt b/stdlib/@tests/stubtest_allowlists/win32-py314.txt
index 83e72a2d7..070fce3e9 100644
--- a/stdlib/@tests/stubtest_allowlists/win32-py314.txt
+++ b/stdlib/@tests/stubtest_allowlists/win32-py314.txt
@@ -1,11 +1,3 @@
-# ====================================================================
-# TODO: New errors in Python 3.14 that need to be fixed or moved below
-# ====================================================================
-
-compression.zlib.ZLIBNG_VERSION
-zlib.ZLIBNG_VERSION
-
-
 # =======
 # >= 3.12
 # =======
diff --git a/stdlib/zlib.pyi b/stdlib/zlib.pyi
index 7cafb44b3..4e410fdd1 100644
--- a/stdlib/zlib.pyi
+++ b/stdlib/zlib.pyi
@@ -4,11 +4,11 @@ from typing import Any, Final, final, type_check_only
 from typing_extensions import Self
 
 DEFLATED: Final = 8
-DEF_MEM_LEVEL: int  # can change
+DEF_MEM_LEVEL: Final[int]
 DEF_BUF_SIZE: Final = 16384
-MAX_WBITS: int
-ZLIB_VERSION: str  # can change
-ZLIB_RUNTIME_VERSION: str  # can change
+MAX_WBITS: Final[int]
+ZLIB_VERSION: Final[str]
+ZLIB_RUNTIME_VERSION: Final[str]
 Z_NO_COMPRESSION: Final = 0
 Z_PARTIAL_FLUSH: Final = 1
 Z_BEST_COMPRESSION: Final = 9
@@ -26,6 +26,10 @@ Z_RLE: Final = 3
 Z_SYNC_FLUSH: Final = 2
 Z_TREES: Final = 6
 
+if sys.version_info >= (3, 14) and sys.platform == "win32":
+    # Available when zlib was built with zlib-ng, usually only on Windows
+    ZLIBNG_VERSION: Final[str]
+
 class error(Exception): ...
 
 # This class is not exposed at runtime. It calls itself zlib.Compress.