From a06f28355dc2b4e080912d0dc6b1f155814a1576 Mon Sep 17 00:00:00 2001
From: Sean <sean@SeandeMac-mini.local>
Date: Mon, 19 Oct 2026 00:04:16 +0800
Subject: [PATCH] fix(markdown): align heading slugs with GitHub anchors

---
 Cargo.lock                     |  1 +
 Cargo.toml                     |  1 +
 src/render/markdown/anchors.rs | 11 ++++++++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 6bb48e2a..48782c38 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -100,6 +100,7 @@ dependencies = [
  "pdf-inspector",
  "quick-xml",
  "sha2 0.11.0",
+ "unicode-properties",
  "zip",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 2a334b72..cedf7af9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,6 +30,7 @@ log = "0.4"
 pdf-inspector = "1.14.2"
 quick-xml = "0.41.0"
 zip = { version = "8.6.0", default-features = false, features = ["deflate"] }
+unicode-properties = "0.1.4"
 
 [profile.release]
 lto = "thin"
diff --git a/src/render/markdown/anchors.rs b/src/render/markdown/anchors.rs
index d56a21cb..1517d365 100644
--- a/src/render/markdown/anchors.rs
+++ b/src/render/markdown/anchors.rs
@@ -9,6 +9,7 @@
 
 use crate::model::{Block, Document, Inline, LinkTarget, inlines_to_plain_text};
 use std::collections::{HashMap, HashSet};
+use unicode_properties::{GeneralCategory, UnicodeGeneralCategory};
 
 pub(crate) struct AnchorMap {
     resolved: HashMap<String, Resolved>,
@@ -185,7 +186,10 @@ fn gfm_slug(text: &str) -> String {
         .filter_map(|c| match c {
             ' ' => Some('-'),
             '-' => Some(c),
-            c if c.is_alphanumeric() || is_combining_mark(c) || is_connector_punctuation(c) => {
+            c if (c.is_alphanumeric() && c.general_category() != GeneralCategory::OtherNumber)
+                || is_combining_mark(c)
+                || is_connector_punctuation(c) =>
+            {
                 Some(c)
             }
             _ => None,
@@ -208,7 +212,9 @@ fn is_combining_mark(c: char) -> bool {
             | 0x1AB0..=0x1AFF
             | 0x1DC0..=0x1DFF
             | 0x20D0..=0x20FF
+            | 0xFE00..=0xFE0F
             | 0xFE20..=0xFE2F
+            | 0xE0100..=0xE01EF
     )
 }
 
@@ -253,6 +259,9 @@ mod tests {
         assert_eq!(gfm_slug("combining n\u{0303} tilde"), "combining-n\u{0303}-tilde");
         assert_eq!(gfm_slug("देवनागरी क्षि"), "देवनागरी-क्षि");
         assert_eq!(gfm_slug("日本語の見出し"), "日本語の見出し");
+        assert_eq!(gfm_slug("❤️ Love"), "️-love");
+        assert_eq!(gfm_slug("2️⃣ Second"), "2️⃣-second");
+        assert_eq!(gfm_slug("x² formula ½"), "x-formula-");
     }
 
     #[test]