Wiki states that `-t X -t Y` should work with 2.9+ but it is not

Hi there,

i'm trying to use the following command line argument pattern:

-k Key1 -v Value1 -k Key2 -v Value2

but it throws an error `... is defined multiple times` even though this [Wiki page](https://github.com/commandlineparser/commandline/wiki/CommandLine-Grammar#sequence-option) states that this is supported.

Is it only possible with unparsing?

So lonG

Start by reproducing the command-line pattern shown in the issue and compare its behavior with the Wiki's sequence-option section. Check whether repeated `-k` and `-v` options are supported in the reported version; done means the behavior is fixed or the Wiki clearly documents the limitation and supported usage.

Written by the indexing model from the issue text.