diff --git a/.github/sync-packages.php b/.github/sync-packages.php
deleted file mode 100644
index 4c47843aa4e..00000000000
--- a/.github/sync-packages.php
+++ /dev/null
@@ -1,71 +0,0 @@
-<?php
-
-if ('cli' !== PHP_SAPI) {
-    echo "This script can only be run from the command line.\n";
-    exit(1);
-}
-
-$mainRepo = 'https://github.com/twigphp/Twig';
-exec('find extra/ -name composer.json', $packages);
-
-foreach ($packages as $package) {
-    $package = dirname($package);
-    $c = file_get_contents($package.'/.gitattributes');
-    $c = preg_replace('{^/\.git.*+\n}m', '', $c);
-    $c .= "/.git* export-ignore\n";
-    file_put_contents($package.'/.gitattributes', $c);
-
-
-    @mkdir($package.'/.github');
-    file_put_contents($package.'/.github/PULL_REQUEST_TEMPLATE.md', <<<EOTXT
-        Please do not submit any Pull Requests here. They will be closed.
-        ---
-
-        Please submit your PR here instead:
-        {$mainRepo}
-
-        This repository is what we call a "subtree split": a read-only subset of that main repository.
-        We're looking forward to your PR there!
-
-        EOTXT
-    );
-
-    @mkdir($package.'/.github/workflows');
-    file_put_contents($package.'/.github/workflows/check-subtree-split.yml', <<<EOTXT
-        name: Check subtree split
-        on:
-          pull_request_target:
-        jobs:
-          close-pull-request:
-            runs-on: ubuntu-latest
-            steps:
-            - name: Close pull request
-              uses: actions/github-script@v6
-              with:
-                script: |
-                  if (context.repo.owner === "twigphp") {
-                    github.rest.issues.createComment({
-                      owner: "twigphp",
-                      repo: context.repo.repo,
-                      issue_number: context.issue.number,
-                      body: `
-                  Thanks for your Pull Request! We love contributions.
-
-                  However, you should instead open your PR on the main repository:
-                  {$mainRepo}
-
-                  This repository is what we call a "subtree split": a read-only subset of that main repository.
-                  We're looking forward to your PR there!
-                  `
-                    });
-                    github.rest.pulls.update({
-                      owner: "twigphp",
-                      repo: context.repo.repo,
-                      pull_number: context.issue.number,
-                      state: "closed"
-                    });
-                  }
-
-        EOTXT
-    );
-}
diff --git a/.github/workflows/package-tests.yml b/.github/workflows/package-tests.yml
deleted file mode 100644
index 620a31d0628..00000000000
--- a/.github/workflows/package-tests.yml
+++ /dev/null
@@ -1,26 +0,0 @@
-name: Verify Packages
-
-on:
-  pull_request:
-    paths:
-      - extra/**
-
-permissions:
-  contents: read
-
-jobs:
-  verify:
-    name: Verify Packages
-    runs-on: Ubuntu-20.04
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Fetch branch from where the PR started
-        run: git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
-
-      - name: Verify subtree-splits are auto-closed
-        run: |
-          php .github/sync-packages.php
-          git add extra/
-          git diff --staged --exit-code || (echo '::error::Please run "php .github/sync-packages.php".' && exit 1)
diff --git a/extra/cache-extra/.gitattributes b/extra/cache-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/cache-extra/.gitattributes
+++ b/extra/cache-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/cache-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/cache-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/cache-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/cache-extra/.github/workflows/check-subtree-split.yml b/extra/cache-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/cache-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/cssinliner-extra/.gitattributes b/extra/cssinliner-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/cssinliner-extra/.gitattributes
+++ b/extra/cssinliner-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/cssinliner-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/cssinliner-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/cssinliner-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/cssinliner-extra/.github/workflows/check-subtree-split.yml b/extra/cssinliner-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/cssinliner-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/html-extra/.gitattributes b/extra/html-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/html-extra/.gitattributes
+++ b/extra/html-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/html-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/html-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/html-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/html-extra/.github/workflows/check-subtree-split.yml b/extra/html-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/html-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/inky-extra/.gitattributes b/extra/inky-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/inky-extra/.gitattributes
+++ b/extra/inky-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/inky-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/inky-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/inky-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/inky-extra/.github/workflows/check-subtree-split.yml b/extra/inky-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/inky-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/intl-extra/.gitattributes b/extra/intl-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/intl-extra/.gitattributes
+++ b/extra/intl-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/intl-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/intl-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/intl-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/intl-extra/.github/workflows/check-subtree-split.yml b/extra/intl-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/intl-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/markdown-extra/.gitattributes b/extra/markdown-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/markdown-extra/.gitattributes
+++ b/extra/markdown-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/markdown-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/markdown-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/markdown-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/markdown-extra/.github/workflows/check-subtree-split.yml b/extra/markdown-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/markdown-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/string-extra/.gitattributes b/extra/string-extra/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/string-extra/.gitattributes
+++ b/extra/string-extra/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/string-extra/.github/PULL_REQUEST_TEMPLATE.md b/extra/string-extra/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/string-extra/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/string-extra/.github/workflows/check-subtree-split.yml b/extra/string-extra/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/string-extra/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }
diff --git a/extra/twig-extra-bundle/.gitattributes b/extra/twig-extra-bundle/.gitattributes
index 14c3c359404..aa02dc6518d 100644
--- a/extra/twig-extra-bundle/.gitattributes
+++ b/extra/twig-extra-bundle/.gitattributes
@@ -1,3 +1,2 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
-/.git* export-ignore
diff --git a/extra/twig-extra-bundle/.github/PULL_REQUEST_TEMPLATE.md b/extra/twig-extra-bundle/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index bbfa2c88b9f..00000000000
--- a/extra/twig-extra-bundle/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,8 +0,0 @@
-Please do not submit any Pull Requests here. They will be closed.
----
-
-Please submit your PR here instead:
-https://github.com/twigphp/Twig
-
-This repository is what we call a "subtree split": a read-only subset of that main repository.
-We're looking forward to your PR there!
diff --git a/extra/twig-extra-bundle/.github/workflows/check-subtree-split.yml b/extra/twig-extra-bundle/.github/workflows/check-subtree-split.yml
deleted file mode 100644
index ff6742d58ba..00000000000
--- a/extra/twig-extra-bundle/.github/workflows/check-subtree-split.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: Check subtree split
-on:
-  pull_request_target:
-jobs:
-  close-pull-request:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Close pull request
-      uses: actions/github-script@v6
-      with:
-        script: |
-          if (context.repo.owner === "twigphp") {
-            github.rest.issues.createComment({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: `
-          Thanks for your Pull Request! We love contributions.
-
-          However, you should instead open your PR on the main repository:
-          https://github.com/twigphp/Twig
-
-          This repository is what we call a "subtree split": a read-only subset of that main repository.
-          We're looking forward to your PR there!
-          `
-            });
-            github.rest.pulls.update({
-              owner: "twigphp",
-              repo: context.repo.repo,
-              pull_number: context.issue.number,
-              state: "closed"
-            });
-          }