diff --git a/.github/workflows/nix-action-master.yml b/.github/workflows/nix-action-master.yml
deleted file mode 100644
index b22092a..0000000
--- a/.github/workflows/nix-action-master.yml
+++ /dev/null
@@ -1,309 +0,0 @@
-jobs:
-  coq:
-    needs: []
-    runs-on: ubuntu-latest
-    steps:
-    - name: Determine which commit to initially checkout
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
-        \ }}\" >> $GITHUB_ENV\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.target_commit }}
-    - name: Determine which commit to test
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
-        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
-        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
-        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
-        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
-        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
-        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.tested_commit }}
-    - name: Cachix install
-      uses: cachix/install-nix-action@v20
-      with:
-        nix_path: nixpkgs=channel:nixpkgs-unstable
-    - name: Cachix setup coq-community
-      uses: cachix/cachix-action@v12
-      with:
-        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        extraPullNames: coq, math-comp
-        name: coq-community
-    - id: stepCheck
-      name: Checking presence of CI target coq
-      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
-        \ bundle \"master\" --argstr job \"coq\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
-        s/.*/built/\") >> $GITHUB_OUTPUT\n"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: Building/fetching current CI target
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq"
-  coq-elpi:
-    needs:
-    - coq
-    runs-on: ubuntu-latest
-    steps:
-    - name: Determine which commit to initially checkout
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
-        \ }}\" >> $GITHUB_ENV\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.target_commit }}
-    - name: Determine which commit to test
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
-        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
-        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
-        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
-        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
-        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
-        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.tested_commit }}
-    - name: Cachix install
-      uses: cachix/install-nix-action@v20
-      with:
-        nix_path: nixpkgs=channel:nixpkgs-unstable
-    - name: Cachix setup coq-community
-      uses: cachix/cachix-action@v12
-      with:
-        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        extraPullNames: coq, math-comp
-        name: coq-community
-    - id: stepCheck
-      name: Checking presence of CI target coq-elpi
-      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
-        \ bundle \"master\" --argstr job \"coq-elpi\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
-        s/.*/built/\") >> $GITHUB_OUTPUT\n"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: coq'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: Building/fetching current CI target
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq-elpi"
-  hierarchy-builder:
-    needs:
-    - coq
-    - coq-elpi
-    runs-on: ubuntu-latest
-    steps:
-    - name: Determine which commit to initially checkout
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
-        \ }}\" >> $GITHUB_ENV\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.target_commit }}
-    - name: Determine which commit to test
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
-        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
-        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
-        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
-        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
-        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
-        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.tested_commit }}
-    - name: Cachix install
-      uses: cachix/install-nix-action@v20
-      with:
-        nix_path: nixpkgs=channel:nixpkgs-unstable
-    - name: Cachix setup coq-community
-      uses: cachix/cachix-action@v12
-      with:
-        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        extraPullNames: coq, math-comp
-        name: coq-community
-    - id: stepCheck
-      name: Checking presence of CI target hierarchy-builder
-      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
-        \ bundle \"master\" --argstr job \"hierarchy-builder\" \\\n   --dry-run 2>&1\
-        \ > /dev/null)\necho $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"\
-        built:\" | sed \"s/.*/built/\") >> $GITHUB_OUTPUT\n"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: coq'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: coq-elpi'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq-elpi"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: Building/fetching current CI target
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "hierarchy-builder"
-  mathcomp:
-    needs:
-    - coq
-    - hierarchy-builder
-    runs-on: ubuntu-latest
-    steps:
-    - name: Determine which commit to initially checkout
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
-        \ }}\" >> $GITHUB_ENV\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.target_commit }}
-    - name: Determine which commit to test
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
-        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
-        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
-        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
-        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
-        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
-        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.tested_commit }}
-    - name: Cachix install
-      uses: cachix/install-nix-action@v20
-      with:
-        nix_path: nixpkgs=channel:nixpkgs-unstable
-    - name: Cachix setup coq-community
-      uses: cachix/cachix-action@v12
-      with:
-        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        extraPullNames: coq, math-comp
-        name: coq-community
-    - id: stepCheck
-      name: Checking presence of CI target mathcomp
-      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
-        \ bundle \"master\" --argstr job \"mathcomp\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
-        s/.*/built/\") >> $GITHUB_OUTPUT\n"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: coq'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-ssreflect'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-ssreflect"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-fingroup'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-fingroup"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-algebra'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-algebra"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-solvable'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-solvable"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-field'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-field"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-character'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-character"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: hierarchy-builder'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "hierarchy-builder"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: Building/fetching current CI target
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp"
-  reglang:
-    needs:
-    - coq
-    runs-on: ubuntu-latest
-    steps:
-    - name: Determine which commit to initially checkout
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
-        \ }}\" >> $GITHUB_ENV\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.target_commit }}
-    - name: Determine which commit to test
-      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
-        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
-        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
-        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
-        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
-        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
-        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
-        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
-    - name: Git checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        ref: ${{ env.tested_commit }}
-    - name: Cachix install
-      uses: cachix/install-nix-action@v20
-      with:
-        nix_path: nixpkgs=channel:nixpkgs-unstable
-    - name: Cachix setup coq-community
-      uses: cachix/cachix-action@v12
-      with:
-        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        extraPullNames: coq, math-comp
-        name: coq-community
-    - id: stepCheck
-      name: Checking presence of CI target reglang
-      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
-        \ bundle \"master\" --argstr job \"reglang\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
-        s/.*/built/\") >> $GITHUB_OUTPUT\n"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: coq'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "coq"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: 'Building/fetching previous CI target: mathcomp-ssreflect'
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "mathcomp-ssreflect"
-    - if: steps.stepCheck.outputs.status == 'built'
-      name: Building/fetching current CI target
-      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
-        --argstr job "reglang"
-name: Nix CI for bundle master
-'on':
-  pull_request:
-    paths:
-    - .github/workflows/nix-action-master.yml
-  pull_request_target:
-    paths-ignore:
-    - .github/workflows/nix-action-master.yml
-    types:
-    - opened
-    - synchronize
-    - reopened
-  push:
-    branches:
-    - master