code: def slice_to_percent_mask(slice_value):
    
    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)]
docs: Convert a python slice [15:50] into a list[bool] mask of 100 elements.