Parser doesn't warn/throw if multiple options with same name

[NeilMacMullen]

For the code below, the helptext is quite happy to list both "abc" options. It would be desirable to generate a run-time warning error.

public class CommonOptions 
{
  [Option("abc")]
  public string X {get;set;}
}

public class DerivedOptions :CommonOptions
{
    [Option("abc")]
    public string Y {get;set;}
}

[moh-hassan]

Good idea.
PR is welcome.
Have a look to this discussion for handling repeated options.

[moh-hassan]

multiple options are allowed starting v2.9