packer.writeMapBegin(v.size());
for (Map.Entry<K, V> e : ((Map<K, V>) v).entrySet()) {
packer.write(e.getKey());
packer.write(e.getValue());
}
packer.writeMapEnd();
}
byte[] bytes = packer.toByteArray();
Unpacker unpacker = msgpack.createUnpacker(new ByteArrayInputStream(bytes));
if (unpacker.trySkipNil()) {
assertEquals(null, v);