FileSystemInfo[] Argument type not parsing in preview4

I was previously using preview1 of this project and had this code
```csharp
AddArgument(new Argument("files-or-directories", LocalizedStrings.BinaryAnalysisContentHelp)
{
Arity = ArgumentArity.OneOrMore,
}.ExistingOnly());
```

which worked as desired, however now it is throwing me an exception:

```
Unhandled exception: System.ArgumentException: Type System.Collections.Generic.IReadOnlyCollection`1[System.IO.FileSystemInfo] cannot be created without a custom binder.
at System.CommandLine.Binding.ArgumentConverter.CreateEnumerable(Type type, Type itemType, Int32 capacity)
```