From cc7ebfd11ef1870fff05c663c4a7f2e2f357a565 Mon Sep 17 00:00:00 2001
From: Benoit Blanchon <git@benoitblanchon.fr>
Date: Thu, 18 Feb 2021 19:40:11 +0100
Subject: [PATCH] deserializeJson() leaves \uXXXX instead of returning
 NotSupported

---
 CHANGELOG.md                                         | 1 +
 extras/tests/MixedConfiguration/decode_unicode_0.cpp | 3 ++-
 src/ArduinoJson/Json/JsonDeserializer.hpp            | 5 ++---
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c3a7d30..2d66adfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ HEAD
 ----
 
 * Removed support for `char` values, see below (issue #1498)
+* `deserializeJson()` leaves `\uXXXX` unchanged instead of returning `NotSupported`
 
 > ### BREAKING CHANGES
 >
diff --git a/extras/tests/MixedConfiguration/decode_unicode_0.cpp b/extras/tests/MixedConfiguration/decode_unicode_0.cpp
index 8b02aec3..b5dc1f17 100644
--- a/extras/tests/MixedConfiguration/decode_unicode_0.cpp
+++ b/extras/tests/MixedConfiguration/decode_unicode_0.cpp
@@ -7,5 +7,6 @@ TEST_CASE("ARDUINOJSON_DECODE_UNICODE == 0") {
   DynamicJsonDocument doc(2048);
   DeserializationError err = deserializeJson(doc, "\"\\uD834\\uDD1E\"");
 
-  REQUIRE(err == DeserializationError::NotSupported);
+  REQUIRE(err == DeserializationError::Ok);
+  REQUIRE(doc.as<std::string>() == "\\uD834\\uDD1E");
 }
diff --git a/src/ArduinoJson/Json/JsonDeserializer.hpp b/src/ArduinoJson/Json/JsonDeserializer.hpp
index 22ceef07..c20cf4ca 100644
--- a/src/ArduinoJson/Json/JsonDeserializer.hpp
+++ b/src/ArduinoJson/Json/JsonDeserializer.hpp
@@ -384,11 +384,10 @@ class JsonDeserializer {
             return false;
           if (codepoint.append(codeunit))
             Utf8::encodeCodepoint(codepoint.value(), _stringStorage);
-          continue;
 #else
-          _error = DeserializationError::NotSupported;
-          return false;
+          _stringStorage.append('\\');
 #endif
+          continue;
         }
 
         // replace char