Filter: exact match takes precedence over wildcard (fixes #1628)

CHANGELOG.md

@@ -6,6 +6,7 @@ HEAD
 
 * Fixed error `'dummy' may be used uninitialized` on GCC 11
 * Fixed error `expected unqualified-id before 'const'` on GCC 11 (issue #1622)
+* Filter: exact match takes precedence over wildcard (issue #1628)
 
 v6.18.3 (2021-07-27)
 -------

extras/tests/JsonDeserializer/filter.cpp

@@ -232,6 +232,15 @@ TEST_CASE("Filtering") {
       "{\"example\":{\"outcome\":42}}",
       2 * JSON_OBJECT_SIZE(1) + 16
     },
+    {
+      // exclusion filter (issue #1628)
+      "{\"example\":1,\"ignored\":2}",
+      "{\"*\":true,\"ignored\":false}",
+      10,
+      DeserializationError::Ok,
+      "{\"example\":1}",
+      JSON_OBJECT_SIZE(1) + 8
+    },
     {
       // only the first element of array counts
       "[1,2,3]",

src/ArduinoJson/Deserialization/Filter.hpp

@@ -32,8 +32,8 @@ class Filter {
   Filter operator[](const TKey& key) const {
     if (_variant == true)  // "true" means "allow recursively"
       return *this;
-    else
-      return Filter(_variant[key] | _variant["*"]);
+    VariantConstRef member = _variant[key];
+    return Filter(member.isNull() ? _variant["*"] : member);
   }
 
  private: