Use and ArrayList<byte[]> as the internal storage, instead of Vector<Byte>. Constructors and methods that supply a byte[] to add to the instance will have that value copied, rather than just taking ownership of the byte[]. There is an argument, on efficiency grounds, for providing methods that take ownership of the supplied argument. The earlier discussions about use of synchronization in the class are revisited. This is a low-level container that should be thread-safe or take precautions against non-thread-safe use. It is anticipated that the vast majority of uses will be thread-safe. Use of synchronization permits occasional deviations from this without imposing any significant overhead for the normal case - uncontended synchronization is close to free. Change-Id: Ifb7b2915d5c96345c53aec8e33673d892c430431