Remove JsonVariant::set(char)

extras/tests/FailingBuilds/CMakeLists.txt

@@ -43,3 +43,5 @@ build_should_fail(delete_jsondocument)
 add_executable(variant_as_char variant_as_char.cpp)
 build_should_fail(variant_as_char)
 
+add_executable(assign_char assign_char.cpp)
+build_should_fail(assign_char)

extras/tests/FailingBuilds/assign_char.cpp

@@ -0,0 +1,12 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2021
+// MIT License
+
+#include <ArduinoJson.h>
+
+// See issue #1498
+
+int main() {
+  DynamicJsonDocument doc(1024);
+  doc["dummy"] = 'A';
+}