Data.isNull return invalid true after proguard

#### Environment details

1. Kotlin Multiplatform Project
2. Compose Multiplatform
3. Youtube API

#### Steps to reproduce

1. Configure Youtube API
2. Create request a videos list using setMine(true)
3. Apply proguard/r8
4. Get error

#### Code example

```java
// example
```

#### Stack trace
```

Field: mine , value: true, isNull: true
Field: part, value [contentDetails], isNull: false

Generated URL: https://youtube.googleapis.com/youtube/v3/channels?part=contentDetails

Exception in thread "AWT-EventQueue-0" com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request
GET https://youtube.googleapis.com/youtube/v3/channels?part=contentDetails
{
"code": 400,
"errors": [
{
"domain": "youtube.parameter",
"location": "parameters.",
"locationType": "other",
"message": "No filter selected. Expected one of: mySubscribers, forUsername, forHandle, categoryId, id, mine, managedByMe",
"reason": "missingRequiredParameter"
}
],
"message": "No filter selected. Expected one of: mySubscribers, forUsername, forHandle, categoryId, id, mine, managedByMe"
}
at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:118)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:37)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$3.interceptResponse(AbstractGoogleClientRequest.java:479)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1111)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:565)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:506)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:616)
at org.malv.youtube.services.YoutubeService$getVideos$2.invokeSuspend(YoutubeService.kt:49)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:1820)
Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@38fc853c, Dispatchers.Main.immediate]

```

#### External references such as API reference guides

isNull method

```
public static boolean isNull(Object object) { // don't call nullOf because will throw IllegalArgumentException if cannot create instance
return object != null && object == NULL_CACHE.get(object.getClass());
}
```

#### Any additional information below

I think the problem is that, after ProGuard, Boolean object is converted to primitives, so, "true" are the same object in NULL_CACHE and it return isNull. If the value is "false" return that is not null.