message: WIP: Use Symbol for service URI
diff: @@ -15,13 +15,13 @@ abstract class AppConfig<S> {
  export const HasConsole = T.hasClass(Console)
  -export const HasFormatURI = "@matechs/core/Eff/_demos/HasFormatURI" as const
  +export const HasFormatURI: unique symbol = Symbol()
  export const HasFormat = T.hasClass(Format, HasFormatURI)
  -export const HasAppConfigURI = "@matechs/core/Eff/_demos/HasAppConfigURI" as const
  +export const HasAppConfigURI: unique symbol = Symbol()
  export const HasAppConfig = T.has(HasAppConfigURI)<AppConfig<string>>()
  -export const ScopedAppConfigURI = "@matechs/core/Eff/_demos/ScopedAppConfigURI" as const
  +export const ScopedAppConfigURI: unique symbol = Symbol()
  export const HasScopedAppConfig = T.hasScoped(ScopedAppConfigURI)(HasAppConfig)
  export const putStrLn = (s: string) =>
  