Minor cleanup: optimize expect_id with while loop and early return\n\nResult: {"status":"keep","combined_µs":4184,"parse_µs":2921,"render_µs":1263,"allocations":25535}

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
-          end
-        end
-        return true if match
-      end
+      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
+      end
+      @ss.pos = start if len
       false
     end