diff --git a/.github/workflows/binaries-windows-arm64.yml b/.github/workflows/binaries-windows-arm64.yml
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+# TRIGGER: Runs on any push to binaries-windows-arm64 or binaries branches.
+# ACTION: Builds, unit-tests and saves windows arm64 binaries with stack and the default ghc.
+
+name: binaries-windows-arm64
+on:
+  push:
+    branches: [ binaries-windows-arm64, binaries ]
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: windows-11-arm
+    defaults:
+      run:
+        shell: bash
+    steps:
+
+    - name: Check out
+      uses: actions/checkout@v4
+      # have to fetch everything for git describe for --version
+      with: 
+        fetch-depth: 0
+
+    # things to be cached/restored:
+
+    - name: process cache of stack global package db
+      id:   stack-global-package-db
+      uses: actions/cache@v4
+      with:
+        path: C:\Users\runneradmin\AppData\Roaming\stack\
+        key: ${{ runner.os }}-appdata-roaming-stack-${{ hashFiles('**.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-appdata-roaming-stack
+
+    - name: process cache of stack programs dir   # ghc, ghc-included packages and their haddocks, mingw, msys2
+      id:   stack-programs-dir
+      uses: actions/cache@v4
+      with:
+        path: C:\Users\runneradmin\AppData\Local\Programs\stack\
+        # which files signal a change in stack's global db ?
+        # **.yaml includes */package.yaml and stack.yaml* (too many), and hopefully no other changing yamls
+        key: ${{ runner.os }}-appdata-local-programs-stack-${{ hashFiles('**.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-appdata-local-programs-stack
+
+    - name: process cache of .stack-work
+      uses: actions/cache@v4
+      with:
+        path: .stack-work
+        key: ${{ runner.os }}-stack-work-${{ hashFiles('**.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-stack-work
+
+    - name: process cache of hledger-lib/.stack-work
+      uses: actions/cache@v4
+      with:
+        path: hledger-lib/.stack-work
+        key: ${{ runner.os }}-hledger-lib-stack-work-${{ hashFiles('hledger-lib/package.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-hledger-lib-stack-work
+
+    - name: process cache of hledger/.stack-work
+      uses: actions/cache@v4
+      with:
+        path: hledger/.stack-work
+        key: ${{ runner.os }}-hledger-stack-work-${{ hashFiles('hledger/package.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-hledger-stack-work
+
+    - name: process cache of hledger-ui/.stack-work
+      uses: actions/cache@v4
+      with:
+        path: hledger-ui/.stack-work
+        key: ${{ runner.os }}-hledger-ui-stack-work-${{ hashFiles('hledger-ui/package.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-hledger-ui-stack-work
+
+    - name: process cache of hledger-web/.stack-work
+      uses: actions/cache@v4
+      with:
+        path: hledger-web/.stack-work
+        key: ${{ runner.os }}-hledger-web-stack-work-${{ hashFiles('hledger-web/package.yaml') }}
+        restore-keys: |
+             ${{ runner.os }}-hledger-web-stack-work
+
+    # - name: showStuff
+    #   run: |
+    #     ls -lFRa /c/users/runneradmin/appdata/roaming/stack
+    #     ls -lFRa /c/users/runneradmin/appdata/local/programs/stack
+
+    # actions:
+
+    # - name: Add stack local bin to PATH
+    #   run: echo "::add-path::C:\Users\runneradmin\AppData\Roaming\stack\local\bin"
+
+    # - name: Install stack
+    #   run: |
+    #     mkdir -p ~/.local/bin
+    #     export PATH=~/.local/bin:$PATH
+    #     if [[ ! -x ~/.local/bin/stack ]]; then curl -sL https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'; chmod a+x ~/.local/bin/stack; fi
+    #     $stack --version
+    #   env:
+    #     stack: ${{ matrix.plan.stack }}
+
+    - name: Install stack
+      #if: steps.stack-programs-dir.outputs.cache-hit != 'true'
+      # this step is needed to get stack.exe into PATH, for now
+      run: |
+        curl -sL https://get.haskellstack.org/stable/windows-x86_64.zip -o stack.zip
+        7z x stack.zip stack.exe
+        which stack
+        printf "stack: "; stack --version
+        which ./stack
+        printf "./stack: "; ./stack --version
+
+    - name: Install GHC
+      # if: steps.stack-programs-dir.outputs.cache-hit != 'true'
+      # set PATH=C:\Users\runneradmin\AppData\Local\Programs\stack\local\bin;%PATH%
+      run: |
+        ./stack --no-terminal setup --install-ghc
+
+    - name: Install haskell deps
+      run: |
+        ./stack --no-terminal build --test --only-dependencies --dry-run
+        ./stack --no-terminal build --test --only-dependencies
+
+    # XXX ghc-pkg not in path
+    # - name: List dep versions
+    #   run: |
+    #     $stack exec -- ghc-pkg list
+
+    - name: Build all hledger modules warning free, optimised and minimised
+      run: |
+        ./stack --no-terminal install --test --force-dirty --ghc-options=-fforce-recomp --ghc-options=-Werror
+      # --ghc-options=-split-sections doesn't work on windows, "too many sections"
+      # --pedantic
+
+    # - name: Install shelltestrunner
+    ## - export PATH=~/.local/bin:$PATH
+    # - if [[ ! -x ~/.local/bin/shelltest ]]; then stack install shelltestrunner-1.10; fi
+    # - shelltest --version
+
+    # run hledger-lib/hledger functional tests, skipping the ones for addons
+    ## - export PATH=~/.local/bin:$PATH
+    #- COLUMNS=80 stack exec -- shelltest --execdir -j16 hledger/test -x /_ -x /addons -x ledger-compat/ledger-baseline -x ledger-compat/ledger-regress -x ledger-compat/ledger-collected
+
+    # artifacts:
+
+    - name: Gather binaries
+      run: |
+        mkdir tmp
+        cp /C/Users/runneradmin/AppData/Roaming/local/bin/hledger.exe tmp
+        cp /C/Users/runneradmin/AppData/Roaming/local/bin/hledger-ui.exe tmp
+        cp /C/Users/runneradmin/AppData/Roaming/local/bin/hledger-web.exe tmp
+        strip tmp/hledger.exe
+        strip tmp/hledger-ui.exe
+        strip tmp/hledger-web.exe
+        tmp/hledger --version
+        tmp/hledger-ui --version
+        tmp/hledger-web --version
+      # Guessing these are not likely to be used on windows.
+      # cp hledger/embeddedfiles/*.1 tmp
+      # cp hledger/embeddedfiles/*.info tmp
+      # cp hledger/shell-completion/hledger-completion.bash tmp
+             
+    - name: Create binaries artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: hledger-windows-arm64
+        path: |
+          tmp/hledger.exe
+          tmp/hledger-ui.exe
+          tmp/hledger-web.exe