ú΢ñ Safe-Inferred-./A function argument that has a  value         optional-args-1.0.0 Data.OptionalbaseControl.ApplicativepureemptyOptionalSpecificDefault$fFractionalOptional $fNumOptional$fIsStringOptional$fMonoidOptional$fMonadPlusOptional$fAlternativeOptional$fMonadOptional$fApplicativeOptional