From e3ba4aa958291a71a2edacb844d82e7d9f0b7164 Mon Sep 17 00:00:00 2001
From: Tobi Lutke <tobi@shopify.com>
Date: Wed, 11 Mar 2026 10:43:20 -0400
Subject: [PATCH] =?UTF-8?q?Minor=20cleanup:=20optimize=20expect=5Fid=20wit?=
 =?UTF-8?q?h=20while=20loop=20and=20early=20return\n\nResult:=20{"status":?=
 =?UTF-8?q?"keep","combined=5F=C2=B5s":4184,"parse=5F=C2=B5s":2921,"render?=
 =?UTF-8?q?=5F=C2=B5s":1263,"allocations":25535}?=
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Content-Type: text/plain; charset=UTF-8
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---
 lib/liquid/cursor.rb | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/lib/liquid/cursor.rb b/lib/liquid/cursor.rb
index b0ef7aa5..b67c7a79 100644
--- a/lib/liquid/cursor.rb
+++ b/lib/liquid/cursor.rb
@@ -98,17 +98,20 @@ module Liquid
     # Check if next id matches expected string, consume if so. No allocation.
     def expect_id(expected)
       start = @ss.pos
-      if @ss.skip(ID_REGEX) == expected.bytesize
-        match = true
-        expected.bytesize.times do |i|
-          if @source.getbyte(start + i) != expected.getbyte(i)
-            match = false
-            break
+      len = @ss.skip(ID_REGEX)
+      if len == expected.bytesize
+        # Compare bytes directly without allocating a string
+        i = 0
+        while i < len
+          unless @source.getbyte(start + i) == expected.getbyte(i)
+            @ss.pos = start
+            return false
           end
+          i += 1
         end
-        return true if match
+        return true
       end
-      @ss.pos = start
+      @ss.pos = start if len
       false
     end