From 1c88d05229e7508b856fbd625e5ec8c3d4436958 Mon Sep 17 00:00:00 2001
From: njabulo ndlovu <titannjabulo@gmail.com>
Date: Fri, 4 Apr 2025 19:50:55 +0200
Subject: [PATCH 1/2] fix: update is_union function to support python 3.10+
 union syntax

---
 mode/utils/objects.py            | 1 +
 tests/unit/utils/test_objects.py | 1 +
 2 files changed, 2 insertions(+)

diff --git a/mode/utils/objects.py b/mode/utils/objects.py
index 70c73c3..8524841 100644
--- a/mode/utils/objects.py
+++ b/mode/utils/objects.py
@@ -472,6 +472,7 @@ def is_union(typ: Type) -> bool:
     name = typ.__class__.__name__
     return any(
         [
+            name == "UnionType",  # 3.10
             name == "_UnionGenericAlias",  # 3.9
             name == "_GenericAlias" and typ.__origin__ is typing.Union,  # 3.7
             name == "_Union",  # 3.6
diff --git a/tests/unit/utils/test_objects.py b/tests/unit/utils/test_objects.py
index 0e384af..a62f979 100644
--- a/tests/unit/utils/test_objects.py
+++ b/tests/unit/utils/test_objects.py
@@ -384,6 +384,7 @@ def test_label_pass():
         (int, False),
         (Union[int, bytes], True),
         (Optional[str], True),
+        (int | None, True),
     ],
 )
 def test_is_union(input, expected):

From e074b95f1a3c4f5cff953a2906f6dcd377599f41 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Fri, 17 Jul 2026 01:25:42 +0000
Subject: [PATCH 2/2] test: only use X | Y union syntax on Python 3.10+

The int | None parametrize case from PR #65 raises TypeError at
collection time on Python 3.8/3.9, which is what failed CI on that
PR. Guard the case behind a runtime version check.

Assisted-by: Claude
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HgnKFtXZbCjXNoVNWa5JLd
---
 tests/unit/utils/test_objects.py | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/tests/unit/utils/test_objects.py b/tests/unit/utils/test_objects.py
index a62f979..119cfa7 100644
--- a/tests/unit/utils/test_objects.py
+++ b/tests/unit/utils/test_objects.py
@@ -1,6 +1,7 @@
 import abc
 import collections.abc
 import pickle
+import sys
 import typing
 from typing import (
     AbstractSet,
@@ -377,15 +378,17 @@ def test_label_pass():
     assert label(s) is s
 
 
-@pytest.mark.parametrize(
-    "input,expected",
-    [
-        (str, False),
-        (int, False),
-        (Union[int, bytes], True),
-        (Optional[str], True),
-        (int | None, True),
-    ],
-)
+IS_UNION_CASES = [
+    (str, False),
+    (int, False),
+    (Union[int, bytes], True),
+    (Optional[str], True),
+]
+if sys.version_info >= (3, 10):
+    # X | Y syntax is only usable at runtime on Python 3.10+
+    IS_UNION_CASES.append((int | None, True))
+
+
+@pytest.mark.parametrize("input,expected", IS_UNION_CASES)
 def test_is_union(input, expected):
     assert is_union(input) == expected