From 62a85cf43a7e0e2cc7ab9c8511ab69836c4fa7a7 Mon Sep 17 00:00:00 2001
From: Khan Winter <35942988+thecoolwinter@users.noreply.github.com>
Date: Tue, 14 Oct 2025 19:12:50 -0500
Subject: [PATCH] Decode 'undefined' values (simple, 23) as `nil`.

---
 Sources/CBOR/Decoder/Containers/DataRegion.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sources/CBOR/Decoder/Containers/DataRegion.swift b/Sources/CBOR/Decoder/Containers/DataRegion.swift
index b9b685f..b3077ea 100644
--- a/Sources/CBOR/Decoder/Containers/DataRegion.swift
+++ b/Sources/CBOR/Decoder/Containers/DataRegion.swift
@@ -66,7 +66,7 @@ struct DataRegion {
 
     func isNil() -> Bool {
         // This shouldn't modify the data stack. We just peek here.
-        type == .simple && argument == 22
+        type == .simple && (argument == 22 || argument == 23)
     }
 
     /// Reads the next variable-sized integer off the data stack.
-- 
2.51.2