macだとちょっとエラー文言が変わる
Swift.DecodingError.dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "Number 1.2 is not representable in Swift." UserInfo={NSDebugDescription=Number 1.2 is not representable in Swift.}))) Program ended with exit code: 0