Convert a python slice [15:50] into a list[bool] mask of 100 elements.

def slice_to_percent_mask(slice_value):
  """Convert a python slice [15:50] into a list[bool] mask of 100 elements."""
  if slice_value is None:
    slice_value = slice(None)
  # Select only the elements of the slice
  selected = set(list(range(100))[slice_value])
  # Create the binary mask
  return [i in selected for i in range(100)]