Skeleton-Bones Crash in release build due to missing proguard rules

Describe the bug Everything works fine when building directly from Android Studio, but as soon as we made a release build, we got a crash:

Fatal Exception: java.lang.IllegalArgumentException: The key must be an application-specific resource id. at android.view.View.setTag(View.java:26098) at com.eudycontreras.boneslibrary.extensions.ViewExtensionsKt.clearProps(ViewExtensionsKt.java:153) at com.eudycontreras.boneslibrary.framework.bones.BoneDrawable$initialize$4.invoke(BoneDrawable.kt:179) at com.eudycontreras.boneslibrary.framework.bones.BoneDrawable$initialize$4.invoke(BoneDrawable.kt:94) at com.eudycontreras.boneslibrary.framework.bones.BoneManager.dispose(BoneManager.kt:108) at com.eudycontreras.boneslibrary.framework.bones.BoneManager$animateFadeOut$3.invoke(BoneManager.kt:166) at com.eudycontreras.boneslibrary.framework.bones.BoneManager$animateFadeOut$3.invoke(BoneManager.kt:23) at com.eudycontreras.boneslibrary.extensions.AnimatorExtensionsKt$animate$$inlined$addListener$1.onAnimationEnd(Animator.kt:117) at android.animation.Animator$AnimatorListener.onAnimationEnd(Animator.java:600) at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1333) at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1575) at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:307) at android.animation.AnimationHandler.-$$Nest$mdoAnimationFrame(AnimationHandler.java) at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:86) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1229) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1239) at android.view.Choreographer.doCallbacks(Choreographer.java:899) at android.view.Choreographer.doFrame(Choreographer.java:827) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1214) at android.os.Handler.handleCallback(Handler.java:942) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7898) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

We fixed this by adding the following line to our app's proguard-rules.pro:

-keep class com.eudycontreras.boneslibrary.framework.bones.BoneProperties { *; }

This was hard to debug, so it would be nice if this line was just added the the proguard-rules file in the library instead :)

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