argv parsing in 5.x to pass a set, how to

まず、示されている Voila コマンドを再現し、TagRemovePreprocessor.remove_cell_tags に対する argparse の処理を調査します。5.x の動作で集合値のオプションがどのように解析されるかを確認し、次に、コマンドが TraitError を発生させずにそのオプションを受け入れた場合に正常に完了することを検証します。issue ではリポジトリのファイルやテストについて言及されていません。

After upgrading to 5.x I can no longer use the command I once was with voila - after having read through other issues and the docs I see the parsing has changed.
https://github.com/voila-dashboards/voila/issues/813

The difficulty I am running into - is I don't see how to pass a set as an option?

For example, I used to use:

voila --no-browser --ExecutePreprocessor.timeout=300 --theme=dark --TagRemovePreprocessor.remove_cell_tags='{"hide"}'

but I get the below error when opening notebooks with voila:

Jan 21 16:56:38 abc-123-086427 voila[2580]:   File "/home/ubuntu/miniconda3/envs/data_analysis_lab/lib/python3.8/site-packages/traitlets/traitlets.py", line 610, in _validate
Jan 21 16:56:38 abc-123-086427 voila[2580]:     value = self.validate(obj, value)
Jan 21 16:56:38 abc-123-086427 voila[2580]:   File "/home/ubuntu/miniconda3/envs/data_analysis_lab/lib/python3.8/site-packages/traitlets/traitlets.py", line 2496, in validate
Jan 21 16:56:38 abc-123-086427 voila[2580]:     value = super(Container, self).validate(obj, value)
Jan 21 16:56:38 abc-123-086427 voila[2580]:   File "/home/ubuntu/miniconda3/envs/data_analysis_lab/lib/python3.8/site-packages/traitlets/traitlets.py", line 1845, in validate
Jan 21 16:56:38 abc-123-086427 voila[2580]:     self.error(obj, value)
Jan 21 16:56:38 abc-123-086427 voila[2580]:   File "/home/ubuntu/miniconda3/envs/data_analysis_lab/lib/python3.8/site-packages/traitlets/traitlets.py", line 690, in error
Jan 21 16:56:38 abc-123-086427 voila[2580]:     raise TraitError(e)
Jan 21 16:56:38 abc-123-086427 voila[2580]: traitlets.traitlets.TraitError: The 'remove_cell_tags' trait of a TagRemovePreprocessor instance expected a set, not the str '{"hide"}'.
Jan 21 16:56:38 abc-123-086427 voila[2580]: ERROR:tornado.access:500 GET /voila/render/beta/BSR/Computational_Thinking/what_is_an_algorithm.ipynb (::1) 204.10ms

So for --TagRemovePreprocessor.remove_cell_tags the error is now saying it is expecting a set and not a str

I have tried many combinations such as:

voila --no-browser --ExecutePreprocessor.timeout=300 --theme=dark --TagRemovePreprocessor.remove_cell_tags=hide

Searching through cli options in argparse I don't see a way to pass a set from the cli that TagRemovePreprocessor.remove_cell_tags is expecting.