From afbcc2106e404231bc0cfedb615b7674e2ae8c9c Mon Sep 17 00:00:00 2001
From: Benoit Blanchon <git@benoitblanchon.fr>
Date: Wed, 12 Jul 2023 11:54:20 +0200
Subject: [PATCH] Fix double call to `size()` in `serializeMsgPack()`

---
 CHANGELOG.md                                  | 1 +
 src/ArduinoJson/MsgPack/MsgPackSerializer.hpp | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2eaa4dd..cd09639e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ HEAD
 
 * Fix compatibility with the Blynk libary (issue #1914)
 * Fix double lookup in `to<JsonVariant>()`
+* Fix double call to `size()` in `serializeMsgPack()`
 
 v6.21.2 (2023-04-12)
 -------
diff --git a/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp b/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp
index 65769a16..6125330c 100644
--- a/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp
+++ b/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp
@@ -47,7 +47,7 @@ class MsgPackSerializer : public Visitor<size_t> {
   size_t visitArray(const CollectionData& array) {
     size_t n = array.size();
     if (n < 0x10) {
-      writeByte(uint8_t(0x90 + array.size()));
+      writeByte(uint8_t(0x90 + n));
     } else if (n < 0x10000) {
       writeByte(0xDC);
       writeInteger(uint16_t(n));