FEATURE: Add isForceSerializeForCollection method to Transcoder

src/main/java/net/spy/memcached/transcoders/SerializingTranscoder.java

@@ -138,6 +138,11 @@ public Object decode(CachedData d) {
     return rv;
   }
 
+  @Override
+  public boolean isForceSerializeForCollection() {
+    return forceJDKSerializeForCollection;
+  }
+
   public CachedData encode(Object o) {
     byte[] b;
     int flags = 0;

src/main/java/net/spy/memcached/transcoders/Transcoder.java

@@ -30,4 +30,11 @@ public interface Transcoder<T> {
    * Get the maximum size of objects handled by this transcoder.
    */
   int getMaxSize();
+
+  /**
+   * Get if this transcoder forces serialization every type.
+   */
+  default boolean isForceSerializeForCollection() {
+    return false;
+  }
 }

src/test/java/net/spy/memcached/transcoders/SerializingTranscoderTest.java

@@ -31,6 +31,11 @@ protected void setUp() throws Exception {
     tu = new TranscoderUtils(true);
   }
 
+  @Test
+  void forceJDKSerializationReturnFalse() {
+    assertFalse(tc.isForceSerializeForCollection());
+  }
+
   @Test
   void testNonserializable() throws Exception {
     try {

src/test/manual/net/spy/memcached/collection/transcoder/CollectionTranscoderTest.java

@@ -29,6 +29,11 @@ protected void tearDown() throws Exception {
     super.tearDown();
   }
 
+  @Test
+  void forceJDKSerializationReturnTrue() {
+    assertTrue(transcoder.isForceSerializeForCollection());
+  }
+
   @Test
   void decodeIntegerAsString() throws ExecutionException, InterruptedException {
     // given