Issue Description:

On macOS:
❯ swift
1> import Foundation
2> URL(fileURLWithPath: "/path/to/b/folder", isDirectory: true).standardizedFileURL.absoluteString == URL(fileURLWithPath: "/path/to/b/folder", isDirectory: true).absoluteString
$R0: Bool = true

On Linux:
❯ swift
1> import Foundation
2> URL(fileURLWithPath: "/path/to/b/folder", isDirectory: true).standardizedFileURL.absoluteString == URL(fileURLWithPath: "/path/to/b/folder", isDirectory: true).absoluteString
$R0: Bool = false

e.g. standardizedFileURL removes trailing slashes on Linux but keeps them on macOS