code: def test_compression_2():
      np = pytest.importorskip("numpy")
      x = np.random.random(10000)
      msg = dumps(to_serialize(x.data), context={"compression": "zlib"})
      compression = msgpack.loads(msg[1]).get("compression")
      assert all(c is None for c in compression)
  
imports: from __future__ import annotations
  import threading
  import zlib
  from concurrent.futures import ThreadPoolExecutor
  import pytest
  import dask.config
  from distributed import Worker, wait
  from distributed.compatibility import LINUX
  from distributed.protocol import dumps, loads, maybe_compress, msgpack, to_serialize
  from distributed.protocol.compression import Compression, compressions, get_compression_settings
  from distributed.utils import nbytes
  from distributed.utils_test import gen_cluster
label_desc: Use image node_id 6 for calling a global function with example usage: test_compression_2() without return types