Apply some marshalling improvements:

1. Marshall instances of java.util.Arrays$ArrayList with ArrayListExternalizer so that it occupies less space.

2. RegularEnumSet and JumboEnumSet should be detected and they should be written using SetExternalizer. For an enum set with a single value, this means going from writing 41 bytes to 10 bytes.

3. Avoid sending OPERATION_X flags when compatibility mode is disabled.

4. Current array support in JBoss Marshalling ends up writing class information even for know types. Try to figure out a way to detect the most commonly written arrays in Infinispan and find an efficient way to marshall them.