Open Radar

 
Summary:
[NSArray arrayWithArray:] now requires a nonnull argument. This was traditionally used a lot in situations where you either have nil or an array, to make sure there’s always an array. Granted, I don’t see that explicitly documented, but it’s something I see a lot in code. (Same behaviour with NSDictionary and NSSet)

Should we continue to do that, or now always fall back to ?: and copy?

Consider code like this:

- (NSArray *)words {
    [self parseTextBlocksIfRequired];
    return [NSArray arrayWithArray:_words];
}

We used arrayWithArray: to 
a) make sure we return immutable data
b) make sure we always return an object and never nil.

I’ll recommend making the signature nullable to keep that useful behavior.