Enumerable of Enum doesn't work if followed by Values

[usr-sse2]

I have such options:

[Option("fm",  Separator=',', Default = new[] { FMode.S })]  
public IEnumerable<FMode> Mode { get; set; }
	 
[Option('q')]
public bool q { get;set; }
	 
[Value(0)]
public IList<string> Files { get; set; }

If I run my application with --fm D,C a.txt arguments, it says that option 'fm' is defined with a bad format. If I put any option between 'fm' and the value list, for example, --fm D,C -q a.txt, it is parsed successfully. You can check it in a fiddle: https://dotnetfiddle.net/yt5L9K

[rmunn]

This is caused by the fact that IEnumerable options try to grab every subsequent non-option argument that follows them, regardless of whether it makes sense, which is why it's grabbing the a.txt and trying to parse that as an FMode enum. I believe that this is non-intuitive behavior and that the way IEnumerable options should work should be changed as follows:

• If there is no separator given, grab all available non-option args
• If a separator is given, but the next non-option arg doesn't contain the separator, continue to grab all available non-option args
• If a separator is given, and the next non-option arg contains the separator, STOP and don't grab any further values (this would be new behavior)

Currently the code follows the first two of those rules, but not the third.

[rmunn]

This will be fixed by #684 once it's merged in.