Why does v41.0.1 have no background property configuration

Please provide the following:

  1. SDK Version: 41.0.1
  2. Platforms(Android/iOS/web/all): all
  3. Add the appropriate “Tag” based on what Expo library you have a question on.

Replace this section with as much relevant information as possible and any relevant code along with your question.

I can also set the background color of the Expo application in version 40.0.0, but I can’t see this configuration in app.json in 41.0.1. Where can I see the comparative documents? A comparison is best to understand.

40.0.0

{
  "expo": {
    "name": "M6",
    "description": "hello world",
    "slug": "M6",
    "version": "1.0.5",
    "orientation": "default",
    "userInterfaceStyle": "dark",
    "icon": "./assets/icon.png",
    "backgroundColor": "#00000088",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#00000088"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/adaptive-icon.png",
        "backgroundColor": "#00000088"
      },
      "package": "com.baorun.handbook.a08"
    },
    "web": {
      "favicon": "./assets/favicon.png"
    }
  }
}

41.0.1

{
  "expo": {
    "name": "test-app",
    "slug": "test-app",
    "version": "1.0.0",
    "orientation": "default",
    "icon": "./assets/images/icon.png",
    "scheme": "myapp",
    "userInterfaceStyle": "automatic",
    "splash": {
      "image": "./assets/images/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#00000000"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/images/adaptive-icon.png",
        "backgroundColor": "#00000000"
      },
      "package": "com.fengmo.testapp"
    },
    "web": {
      "favicon": "./assets/images/favicon.png"
    }
  }
}