0.9.0 broke positional argument passing about commander HOT 2 CLOSED

$ curl -s https://flr.li/F1cZ7x | tar xv
Package.resolved
Package.swift
Sources/
Sources/test/
Sources/test/main.swift

$ cat Sources/test/main.swift 
import Commander

func main(source: String, output: String, size: String) throws {
    // ...
    print("Source \(source)")
    print("Output \(output)")
    print("Size \(size)")
}

command(
    Argument<String>("source", description: "Source SVG file"),
    Argument<String>("output", description: "Output path for resulting asset"),
    Option<String>("size", default: "64x64", description: "Size (in points) of the output asset (e.g. 120x120)"),
    main
).run()

$ swift run test
...
Creating working copy for https://github.com/kylef/Commander
Working copy of https://github.com/kylef/Commander resolved at 0.9.2
[19/19] Build complete!
An error occurred: Missing value for `source`

$ swift run test a
[0/0] Build complete!
An error occurred: Missing value for `output`

$ swift run test a b
[0/0] Build complete!
Source a
Output b
Size 64x64

$ swift run test a b --size 128x128
[0/0] Build complete!
Source a
Output b
Size 128x128