From a3bdebb506882fc8866ebe4ac22b50f6323d1272 Mon Sep 17 00:00:00 2001
From: Alexis Montoison <35051714+amontoison@users.noreply.github.com>
Date: Fri, 3 Jul 2026 16:04:30 -0600
Subject: [PATCH 1/2] Add downgrade compatibility workflow

This workflow runs tests for different downgrade modes and Julia versions on push and pull request events.

Related discussion: https://github.com/orgs/JuliaSmoothOptimizers/discussions/73

cc @MaxenceGollier
---
 .github/workflows/downgrade-compat.yaml | 32 +++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 .github/workflows/downgrade-compat.yaml

diff --git a/.github/workflows/downgrade-compat.yaml b/.github/workflows/downgrade-compat.yaml
new file mode 100644
index 0000000..1884516
--- /dev/null
+++ b/.github/workflows/downgrade-compat.yaml
@@ -0,0 +1,32 @@
+
+name: Downgrade-compat
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        downgrade_mode: ['deps', 'alldeps']
+        julia-version: ['lts', '1']
+        julia-arch: [x64]
+        os: [ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.julia-arch }}
+      - uses: julia-actions/julia-downgrade-compat@v2
+        with:
+          mode: ${{ matrix.downgrade_mode }}
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+        with:
+          allow_reresolve: false
+          force_latest_compatible_version: false

From b4a3a36b3578f40fd496bec280c5cc2a73695b5d Mon Sep 17 00:00:00 2001
From: Alexis Montoison <35051714+amontoison@users.noreply.github.com>
Date: Wed, 15 Jul 2026 10:30:09 -0600
Subject: [PATCH 2/2] Update .github/workflows/downgrade-compat.yaml

Co-authored-by: Maxence Gollier <134112149+MaxenceGollier@users.noreply.github.com>
---
 .github/workflows/downgrade-compat.yaml | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/.github/workflows/downgrade-compat.yaml b/.github/workflows/downgrade-compat.yaml
index 1884516..c952baa 100644
--- a/.github/workflows/downgrade-compat.yaml
+++ b/.github/workflows/downgrade-compat.yaml
@@ -2,11 +2,7 @@
 name: Downgrade-compat
 
 on:
-  push:
-    branches:
-      - main
-  pull_request:
-    types: [opened, synchronize, reopened]
+  workflow_call:
 
 jobs:
   test: