Single dash in value treated as Option

Hi,
this seems strange, but I'm having problem with using Parser like:
--parameter "-someValue", because Parser treats "-someValue" as Option, which can't find.

Here in wiki, we can see --suffix parameter with value "-2019". It doesn't seem to work in my project.
https://github.com/commandlineparser/commandline/wiki/Option-Groups

option EnableDashDash = true doesn't help either. Any help with this?

No source files or tests are named. Start by reproducing the command-line invocation from the report and compare it with the Option-Groups wiki example, including EnableDashDash. Done means a value such as "-someValue" is accepted as the value for --parameter rather than parsed as another option.

Written by the indexing model from the issue text.