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  • In reference to your last sentence, by default foo will not give warnings, but some static type analyzers have strict options to force a type annotation to be present everywhere, causing an unannotated foo to be an error. Commented Sep 10, 2020 at 5:00
  • @MarioIshac: I suspected that, changed my answer accordingly, thanks! Commented Sep 10, 2020 at 6:05