1.1.8.2. osx.NumberObjectConversion (C, C++, ObjC)
Check for erroneous conversions of objects representing numbers into numbers.

Examples:

NSNumber *photoCount = [albumDescriptor objectForKey:@"PhotoCount"];
// Warning: Comparing a pointer value of type 'NSNumber *'
// to a scalar integer value
if (photoCount > 0) {
  [self displayPhotos];
}