protected void readObjectData(Collection<Object> obj, ReadContext ctx, Reader in, int length) {
for (int i = 0; i < length; i++) {
obj.add(Streamer.get().readObject(ctx, in));
}
}
protected void writeObjectData(Collection<?> obj, WriteContext ctx, Writer out) {
out.writeInt(obj.size());
for (Object o : obj) Streamer.get().writeObject(o, ctx, out);
}