- fix slicing bug

- add pytest workflow

.github/workflows/pytest.yml

@@ -0,0 +1,78 @@
+name: pytest
+
+on: [ workflow_dispatch, workflow_call, push, pull_request ]
+
+permissions:
+  contents: read
+
+jobs:
+  pypi_publish:
+    name: Publish (pypi.org)
+    runs-on: ubuntu-latest
+    env:
+      CARGO_HOME: ${{ github.workspace }}/.cargo
+      RUSTUP_HOME: ${{ github.workspace }}/.rustup
+      RUSTUP_TOOLCHAIN: stable
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          submodules: recursive
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.x
+
+      - name: Restore cache
+        uses: actions/cache/restore@v4
+        with:
+          path: |
+            ~/.cache/pip
+            ~/.cache/pip-wheel
+            ~/.cache/sccache
+            ${{ env.CARGO_HOME }}
+          key: cache-ubuntu-maturin-cross-compile
+
+      - name: Install build dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y build-essential cmake clang llvm lld libclang
+        shell: bash
+
+      - name: Install Rust
+        run: |
+          export PATH="$CARGO_HOME/bin:$PATH"
+          if ! command -v rustup >/dev/null 2>&1; then
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          fi
+          rustup toolchain install stable --profile minimal
+          rustup default stable
+          echo "$CARGO_HOME/bin" >> "$GITHUB_PATH"
+          cargo --version
+        shell: bash
+
+      - name: Install sccache and maturin
+        run: |
+          python -m pip install --upgrade pip maturin ziglang cargo-zigbuild
+          # in case an older copy was cargo-installed into the CARGO_HOME cache,
+          # prevent it from shadowing the pip-installed one
+          rm -f "${CARGO_HOME:?}/bin/cargo-zigbuild" || true
+          if ! command -v sccache >/dev/null 2>&1; then
+            cargo install sccache || pip install sccache
+          fi
+        shell: bash
+
+      - name: PyTest
+        run: |
+          python -m pip install .
+          python -m pytest 
+
+      - name: Store cache
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            ~/.cache/pip
+            ~/.cache/pip-wheel
+            ~/.cache/sccache
+            ~/.cache/cargo-xwin
+            ${{ env.CARGO_HOME }}
+            ~/.osxcross
+          key: cache-ubuntu-maturin-cross-compile