code: def setup(self, unique, keep, dtype):
      N = 10**5
      data = pd.Series(np.arange(N), dtype=dtype)
      data[list(range(1, N, 100))] = pd.NA
      if not unique:
          data = data.repeat(5)
      self.ser = data
      # cache is_unique
      self.ser.is_unique
  
imports: from importlib import import_module
  import numpy
  import pandas
  from .pandas_vb_common import setup
label_desc: Use image node_id 1 for calling the DuplicatedMaskedArray obj's underlying member method code with example usage: obj.setup(unique, keep, dtype) without return types