[weather] parsing api response is broken

Device / Emulator and OS

Please complete the following information for each phone and/or emulator you're experiencing this bug on: Not Platform related

NB: Bugs pertaining to old devices/OS versions will likely not be fixed.

For iOS only the latest OS is supported.
For Android, see the OS versions for which Google support security fixes**

Describe the bug

Values that come from the API as int and should be parsed in the Weather class as double are not matched. An example for this is _windDegree or humidity, it is always null.

To Reproduce

Run example App and load weather.

Expected behavior

The _unpackDouble function should also accept int and parse it to double.

Actual behavior

API Response:

{
   "coord":{
      "lon":9,
      "lat":48
   },
   "weather":[
      {
         "id":500,
         "main":"Rain",
         "description":"light rain",
         "icon":10d
      }
   ],
   "base":"stations",
   "main":{
      "temp":279.87,
      "feels_like":276.48,
      "temp_min":278.15,
      "temp_max":281.48,
      "pressure":1013,
      "humidity":81
   },
   "visibility":10000,
   "wind":{
      "speed":5.36,
      "deg":337
   },
   "rain":{
      "1h":0.65
   },
   "clouds":{
      "all":100
   },
   "dt":1619879340,
   "sys":{
      "type":3,
      "id":2000043,
      "country":"DE",
      "sunrise":1619841940,
      "sunset":1619894179
   },
   "timezone":7200,
   "id":2942451,
   "name":"Buchheim",
   "cod":200
}

Weather Object:

          Place Name: Buchheim [DE] (null, null)
          Date: 2021-05-01 16:29:00.000
          Weather: Rain, light rain
          Temp: 6.7 Celsius, Temp (min): 5.0 Celsius, Temp (max): 8.3 Celsius,  Temp (feels like): 3.3 Celsius
          Sunrise: 2021-05-01 06:05:40.000, Sunset: 2021-05-01 20:36:19.000
          Wind: speed 5.36, degree: null, gust null
          Weather Condition code: 500

Screenshots

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Flutter doctor

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Additional information

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cph-cachet / flutter-plugins