Fix object hashing in schema

include/rapidjson/schema.h

@@ -367,7 +367,9 @@ public:
         uint64_t h = Hash(0, kObjectType);
         uint64_t* kv = stack_.template Pop<uint64_t>(memberCount * 2);
         for (SizeType i = 0; i < memberCount; i++)
-            h ^= Hash(kv[i * 2], kv[i * 2 + 1]);  // Use xor to achieve member order insensitive
+            // Issue #2205
+            // Hasing the key to avoid key=value cases with bug-prone zero-value hash
+            h ^= Hash(Hash(0, kv[i * 2]), kv[i * 2 + 1]);  // Use xor to achieve member order insensitive
         *stack_.template Push<uint64_t>() = h;
         return true;
     }