Problems with Objective-C annotations

from blog The Desolation of Blog, | ↗ original
In recent years, the clang compiler has added a number of source annotations to Objective-C in order to clarify API intent. For example, NS_DESIGNATED_INITIALIZER formalizes the traditional Objective-C designated initializer pattern. To facilitate interoperability with Swift, Objective-C adopted nullibility annotations: nullable, _Nullable, nonnull, _Nonnull. As with all changes, however, there are tradeoffs. The use of these annotations comes with a price. Consider the following (dummy) code illustrating the designated initializer pattern (and nothing else):
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