code: def serialize_numpy_maskedarray(x, context=None):
      data_header, frames = serialize_numpy_ndarray(x.data)
      header = {"data-header": data_header, "nframes": len(frames)}
  
      # Serialize mask if present
      if x.mask is not np.ma.nomask:
          mask_header, mask_frames = serialize_numpy_ndarray(x.mask)
          header["mask-header"] = mask_header
          frames += mask_frames
  
      # Only a few dtypes have python equivalents msgpack can serialize
      if isinstance(x.fill_value, (np.integer, np.floating, np.bool_)):
          serialized_fill_value = (False, x.fill_value.item())
      else:
          serialized_fill_value = (
              True,
              pickle.dumps(
                  x.fill_value,
                  protocol=(context or {}).get("pickle-protocol", None),
              ),
          )
      header["fill-value"] = serialized_fill_value
  
      return header, frames
  
file_path: distributed/distributed/protocol/numpy.py
imports: from __future__ import annotations
  import math
  import numpy
  from packaging.version import parse
  from distributed.protocol import pickle
  from distributed.protocol.serialize import dask_deserialize, dask_serialize
  from distributed.utils import log_errors
label_desc: Use image node_id 6 for calling a global function with example usage: serialize_numpy_maskedarray(x, context) and returns: header,  frames