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diff --git a/src/main/java/com/code_intelligence/jazzer/mutation/api/SerializingMutator.java b/src/main/java/com/code_intelligence/jazzer/mutation/api/SerializingMutator.java
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+/*
+ * Copyright 2023 Code Intelligence GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.code_intelligence.jazzer.mutation.api;
+
+import com.google.errorprone.annotations.DoNotMock;
+
+/**
+ * Combines a {@link ValueMutator} with a {@link Serializer} for objects of type {@code T}.
+ *
+ * <p>Implementing classes SHOULD be declared final.
+ *
+ * <p>This is the default fully-featured mutator type. If {@code T} can be mutated fully in place,
+ * consider implementing the more versatile {@link SerializingInPlaceMutator} instead.
+ */
+@DoNotMock("Use TestSupport#mockMutator instead")
+public abstract class SerializingMutator<T> implements Serializer<T>, ValueMutator<T> {
+  @Override
+  public final String toString() {
+    return Debuggable.getDebugString(this);
+  }
+}