- Issue in #622 is that its command type is `String` and internally
some incoming arguments(it's List) were converted to String by
joining with space. This caused one case with help command to get
conversion via spring's ConversionService(CollectionToStringConverter)
which joins by commas. That was we saw in failed example.
- Remove needed joins in CommandParser and let it just pass List which
then works better with ConversionService.
- This then needs a `command` option type change from String to String[]
which it really is as you should be able to give whole command as
an argument.
- Backport #622
- Fixes#623
b853112e0b