From f7f0293ce575c7d5a41d31033845c403460cc85f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Ingvar=20Dahlgren?= <bjodah@gmail.com>
Date: Mon, 24 Nov 2025 10:30:37 +0100
Subject: [PATCH 1/4] more explicit testing of pickling of user defined symbol

---
 symengine/tests/test_pickling.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/symengine/tests/test_pickling.py b/symengine/tests/test_pickling.py
index a51a3251..19afafee 100644
--- a/symengine/tests/test_pickling.py
+++ b/symengine/tests/test_pickling.py
@@ -31,11 +31,17 @@ def __reduce__(self):
 def test_pysymbol():
     a = MySymbol("hello", attr=1)
     b = pickle.loads(pickle.dumps(a + 2)) - 2
+    c = MySymbol("hello", attr=-1)
     try:
         assert a == b
+        assert type(a) == type(b)
+        assert a.attr == 1
+        assert b.attr == 1
+        assert b != c
     finally:
         a._unsafe_reset()
         b._unsafe_reset()
+        c._unsafe_reset()
 
     a = MySymbolBase("hello", attr=1)
     try:

From 66a63b9274d4e65516a05e3409975a7298073d72 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Ingvar=20Dahlgren?= <bjodah@gmail.com>
Date: Mon, 24 Nov 2025 12:24:05 +0100
Subject: [PATCH 2/4] pickling test correctness

---
 symengine/tests/test_pickling.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/symengine/tests/test_pickling.py b/symengine/tests/test_pickling.py
index 19afafee..cefbbfb6 100644
--- a/symengine/tests/test_pickling.py
+++ b/symengine/tests/test_pickling.py
@@ -22,8 +22,15 @@ def __eq__(self, other):
             return False
         return self.name == other.name and self.attr == other.attr
 
+    def __ne__(self, other):
+        return not (self == other)
+
+    def __hash__(self, other):
+        return hash((self.__class__.__name__, self.name, self.attr))
+
 
 class MySymbol(MySymbolBase):
+
     def __reduce__(self):
         return (self.__class__, (self.name, self.attr))
 

From 87ff8a3d3de5f0c9e05921f9c7baf7096f99d441 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Ingvar=20Dahlgren?= <bjodah@gmail.com>
Date: Mon, 24 Nov 2025 13:46:25 +0100
Subject: [PATCH 3/4] use first commit from symengine/symengine#2129

---
 appveyor.yml               | 2 ++
 bin/test_symengine_unix.sh | 2 ++
 symengine_version.txt      | 2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/appveyor.yml b/appveyor.yml
index cdf0ee1b..1dd4c405 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -74,6 +74,8 @@ install:
 
 - set /p commit=<symengine_version.txt
 - cd symengine-cpp
+- git config --add remote.origin.fetch "+refs/pull/*/head:refs/remotes/origin/pr/*"
+- git fetch
 - git checkout %commit%
 - mkdir build
 - cd build
diff --git a/bin/test_symengine_unix.sh b/bin/test_symengine_unix.sh
index 0c62b7d1..81245174 100644
--- a/bin/test_symengine_unix.sh
+++ b/bin/test_symengine_unix.sh
@@ -4,6 +4,8 @@ export MAKEFLAGS="-j2"
 
 git clone https://github.com/symengine/symengine symengine-cpp
 cd symengine-cpp
+git config --add remote.origin.fetch '+refs/pull/*/head:refs/remotes/origin/pr/*'
+git fetch
 export SOURCE_DIR=`pwd`
 git checkout `cat ../symengine_version.txt`
 cd ..
diff --git a/symengine_version.txt b/symengine_version.txt
index 57395265..c6fabd2c 100644
--- a/symengine_version.txt
+++ b/symengine_version.txt
@@ -1 +1 @@
-8a3bc848cd8246a4c15eee9bddc15de0d1157812
+b9b11156a76470f0e6998476b2550573efdb5aae

From fc2d421a7adca0e639ec32d9c9b3a68d58c6863a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Ingvar=20Dahlgren?= <bjodah@gmail.com>
Date: Mon, 24 Nov 2025 15:38:36 +0100
Subject: [PATCH 4/4] Use second commit (explicit 1st template arg)

---
 symengine_version.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/symengine_version.txt b/symengine_version.txt
index c6fabd2c..470f7b84 100644
--- a/symengine_version.txt
+++ b/symengine_version.txt
@@ -1 +1 @@
-b9b11156a76470f0e6998476b2550573efdb5aae
+d10ee0be16d25f1e35d5cd31d6ac2788eb426833