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