From 38b10d5fadeb649b8c9632ce3fc849a1724aaf8d Mon Sep 17 00:00:00 2001
From: Hyeseong Kim <hey@hyeseong.kim>
Date: Thu, 30 Jul 2026 06:16:01 +0900
Subject: [PATCH 1/3] add a counterexample to confirm G9Bc correctness

---
 test/grapheme.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/grapheme.js b/test/grapheme.js
index 8d9056f..8e5b995 100644
--- a/test/grapheme.js
+++ b/test/grapheme.js
@@ -353,6 +353,10 @@ test('counterexamples', async t => {
     'क‌्क',
     'कﾞ्क',
     'ൎക്ക',
+    // GB9c: U+0A4D (Gurmukhi Sign Virama) is *not* InCB=Linker per DerivedCoreProperties.txt;
+    // the lib must not treat it as one even when it appears inside an InCB=Consonant run from another script
+    '\u0915\u0A4D\u0915', // DEVANAGARI KA + GURMUKHI VIRAMA + DEVANAGARI KA
+    '\u0A15\u0A4D\u0A15', // pure Gurmukhi KA + virama + KA (InCB=None - harmless)
     // Hangul Jamo Extended-B boundaries; U+D7FC..U+D7FF are unassigned
     '가퟼',
     'ퟻ퟼',

From e800619e7a8d44d21b85cfcafd0451508587ed92 Mon Sep 17 00:00:00 2001
From: Hyeseong Kim <hey@hyeseong.kim>
Date: Thu, 30 Jul 2026 06:19:13 +0900
Subject: [PATCH 2/3] fix it

---
 src/grapheme.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/grapheme.js b/src/grapheme.js
index bf0ec83..fdc8ce8 100644
--- a/src/grapheme.js
+++ b/src/grapheme.js
@@ -151,7 +151,6 @@ const PAIR = Uint8Array.from(grapheme_pairs);
 function isLinker(cp) {
   return cp === 0x094D  // Devanagari Sign Virama
     || cp === 0x09CD    // Bengali Sign Virama
-    || cp === 0x0A4D    // Gurmukhi Sign Virama
     || cp === 0x0ACD    // Gujarati Sign Virama
     || cp === 0x0B4D    // Oriya Sign Virama
     || cp === 0x0C4D    // Telugu Sign Virama

From 791641a758b89959701c09da110e84579015e8c6 Mon Sep 17 00:00:00 2001
From: Hyeseong Kim <hey@hyeseong.kim>
Date: Thu, 30 Jul 2026 06:21:14 +0900
Subject: [PATCH 3/3] changeset

---
 .changeset/short-toes-fix.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/short-toes-fix.md

diff --git a/.changeset/short-toes-fix.md b/.changeset/short-toes-fix.md
new file mode 100644
index 0000000..fc1db2d
--- /dev/null
+++ b/.changeset/short-toes-fix.md
@@ -0,0 +1,5 @@
+---
+"unicode-segmenter": patch
+---
+
+Fixed G9Bc edge case. The `0x0A4D` (Gurmukhi Sign Virama) was incorrectly treated as InCB=Linker.