code: def ensure_int64_or_float64(arr, copy=False):
      
      try:
          return arr.astype('int64', copy=copy, casting='safe')
      except TypeError:
          return arr.astype('float64', copy=copy)
docs: Ensure that an dtype array of some integer dtype
      has an int64 dtype if possible
      If it's not possible, potentially because of overflow,
      convert the array to float64 instead.
  
      Parameters
      ----------
      arr : array-like
            The array whose data type we want to enforce.
      copy: boolean
            Whether to copy the original array or reuse
            it in place, if possible.
  
      Returns
      -------
      out_arr : The input array cast as int64 if
                possible without overflow.
                Otherwise the input array cast to float64.