How to pass parameter name with suffix number?

[sulmar]

How to pass parameter name in format {char}{number}?

Code example:

CoconaApp.Run(([Option("L1")] string line1, [Option("L2")] string line2) =>
{
    Console.WriteLine($"Hello {line1}\n{line2}");
});

--L1 Hello --L2 World

I have got error:
Error: Unknown option 'L1'

[mayuki]

This is not because of the numbers. The error is due to the option name is case-sensitive.