Re: Fixing bug #4128333: Serializing strings restricted to 64k bytes

I see now that ObjectOutputStream.html#useProtocolVersion() already exists: http://java.sun.com/javase/6/docs/api/java/io/ObjectOutputStream.html#useProtocolVersion(int)

so the only thing we'd need to do in step 2 is add ObjectStreamConstants.PROTOCOL_VERSION_3.