code: def setup(self, size):
      arr = np.arange(size).astype("uint64") + 2**63
      self.data1 = StringIO("\n".join(arr.astype(str).tolist()))
      arr = arr.astype(object)
      arr[500] = -1
      self.data2 = StringIO("\n".join(arr.astype(str).tolist()))
  
imports: from .common import Benchmark, get_squares, get_squares_
  import numpy
  from io import SEEK_SET, StringIO, BytesIO
label_desc: Use image node_id 1 for calling the LoadtxtReadUint64Integers obj's underlying member method code with example usage: obj.setup(size) without return types