in SampleApp/Sources/FishyActorsDemo/_PrettyDemoLogger.swift [298:304]
mutating func appendInterpolation(pretty subject: Any) {
if let prettySubject = subject as? CustomPrettyStringConvertible {
self.appendLiteral(prettySubject.prettyDescription)
} else {
self.appendLiteral("\(reflecting: subject)")
}
}