Example with Option with IEnumerable<string> broken - Sequence contains more than one element

Running the latest commandlineparser v2.3.0 on .Net Core 2.1.

The library example doesn't seem to work at all parsing IEnumerable [Option('r', "read", Required = true, HelpText = "Input files to be processed.")] public IEnumerable InputFiles { get; set; }

If you specify --read file1 file2 you get this exception:

System.InvalidOperationException HResult=0x80131509 Message=Sequence contains more than one element Source=System.Linq StackTrace:

System.Linq.dll!System.Linq.Enumerable.Single<System.Type>(System.Collections.Generic.IEnumerable<System.Type> source) Line 45 C# CommandLine.dll!CommandLine.Core.InstanceBuilder.Build.AnonymousMethod__0_23(CommandLine.Core.SpecificationProperty sp) Unknown CommandLine.dll!CommandLine.Core.ReflectionExtensions.SetProperties.AnonymousMethod__0(System.__Canon current, CommandLine.Core.SpecificationProperty specProp) Unknown System.Linq.dll!System.Linq.Enumerable.Aggregate<CommandLine.Core.SpecificationProperty, LogMerger.Program.Options>(System.Collections.Generic.IEnumerable<CommandLine.Core.SpecificationProperty> source, LogMerger.Program.Options seed, System.Func<LogMerger.Program.Options, CommandLine.Core.SpecificationProperty, LogMerger.Program.Options> func) Line 55 C# CommandLine.dll!CommandLine.Core.InstanceBuilder.Build.AnonymousMethod__16() Unknown CommandLine.dll!CommandLine.Core.InstanceBuilder.Build.AnonymousMethod__7() Unknown CommandLine.dll!CommandLine.Parser.ParseArguments<LogMerger.Program.Options>(System.Collections.Generic.IEnumerable args) Unknown