diff --git a/.github/workflows/update_version.yml b/.github/workflows/update_version.yml
new file mode 100644
index 0000000..fc261c2
--- /dev/null
+++ b/.github/workflows/update_version.yml
@@ -0,0 +1,51 @@
+name: Release via GitHub Tag (with dev versions)
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install tools
+        run: |
+          cargo install cargo-set-version
+
+      - name: Extract version from tag
+        id: version
+        run: |
+          TAG=${GITHUB_REF_NAME}
+          VERSION=${TAG#v}
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "Detected version: $VERSION"
+
+      - name: Set release version
+        run: |
+          VERSION=${{ steps.version.outputs.version }}
+          echo "Setting release version $VERSION"
+          cargo set-version $VERSION
+
+      - name: Commit release version bump
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          BRANCH="${{ github.event.release.target_commitish }}"
+          git add Cargo.toml
+          git commit -m "chore: set release version v${{ steps.version.outputs.version }}"
+          git push origin HEAD:$BRANCH
+
+      - name: Move release tag to new commit
+        run: |
+          TAG=${{ github.event.release.tag_name }}
+          git tag -fa "$TAG" -m "Release $TAG (after version bump)"
+          git push origin "$TAG" --force
diff --git a/Cargo.toml b/Cargo.toml
index 63555d3..d019d78 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "polyshell"
-version = "0.1.0"
+version = "0.0.2-test"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/src/algorithms/simplify_charshape.rs b/src/algorithms/simplify_charshape.rs
index 6459124..43ea68c 100644
--- a/src/algorithms/simplify_charshape.rs
+++ b/src/algorithms/simplify_charshape.rs
@@ -92,27 +92,27 @@ fn characteristic_shape<T>(orig: &Polygon<T>, eps: T, max_len: usize) -> Polygon
 where
     T: GeoFloat + SpadeNum,
 {
-    let orig_len = orig.exterior().0.len();
-
-    if orig_len < 3 {
+    if orig.exterior().0.len() < 3 {
         return orig.clone();
     }
 
     let eps_2 = eps * eps;
 
     // Construct Delaunay triangulation
+    let num_vertices = orig.exterior().0.len() - 1;
+
     let vertices = orig
         .exterior_coords_iter()
-        .take(orig_len - 1) // duplicate points are removed
+        .take(num_vertices) // duplicate points are removed
         .map(|c| Point2::new(c.x, c.y))
         .collect::<Vec<_>>();
 
-    let edges = (0..orig_len - 2)
+    let edges = (0..num_vertices)
         .map(|i| {
             if i == 0 {
                 [vertices.len() - 1, i]
             } else {
-                [i, i + 1]
+                [i - 1, i]
             }
         })
         .collect::<Vec<_>>();
@@ -143,8 +143,7 @@ where
             continue;
         }
 
-        let [from, to] = largest.edge.vertices().map(|v| v.index());
-        if (to == from + 1) || (from == to + 1) || (to + from + 2 == orig_len) {
+        if largest.edge.is_constraint_edge() {
             continue;
         }