Ignore write to member

extras/tests/JsonVariant/link.cpp

@@ -72,4 +72,11 @@ TEST_CASE("Linked document") {
   SECTION("get member") {
     CHECK(variant["hello"].as<std::string>() == "world");
   }
+
+  SECTION("set member") {
+    // The link is read-only; the following line should have no side effect
+    variant["tutu"] = "toto";
+
+    CHECK(doc1.as<std::string>() == "{\"hello\":\"world\"}");
+  }
 }

src/ArduinoJson/Variant/VariantData.hpp

@@ -314,7 +314,7 @@ class VariantData {
                               TStoragePolicy storage_policy) {
     if (isNull())
       toObject();
-    if (!isObject())
+    if (!isObjectStrict())
       return 0;
     return _content.asCollection.getOrAddMember(key, pool, storage_policy);
   }