message: Copying the detections to prevent changes through an NSMutableArray
diff: @@ -21,7 +21,7 @@ limitations under the License.
  self = [super init];
  if (self) {
  _boundingBox = boundingBox;
  - _categories = categories;
  + _categories = [categories copy];
  }
  return self;
  }
  @@ -33,7 +33,7 @@ limitations under the License.
  - (instancetype)initWithDetections:(NSArray<TFLDetection *> *)detections {
  self = [super init];
  if (self) {
  - _detections = detections;
  + _detections = [detections copy];
  }
  return self;
  }
  