It's not possible to upload an array column with a single value

I have an array column and sometimes it has a single value.

1. If the value of that column is `[0]` the script treats it as a string.
2. If I specify `--parse-arrays=column` that it creates an array column with `[0]` as a string value, .e. `["[0]"]`.
3. If the column has the value `0` and `--parse-arrays=column` it throws an error because it does not find a comma
4. If the column has the value `0,` and `--parse-arrays=column` it creates an array like this `["0",""]`

Hence it seems not possible to upload arrays with a single value.

Start by reproducing the four cases in the CLI with --parse-arrays=column, focusing on how array-column values are parsed. Done means a single value such as [0], 0, or 0, is handled as an array according to the intended behavior without producing the reported string value or error.

Written by the indexing model from the issue text.