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Table Of Contents 1. Nullable types 2. Nullable types under the hood 3. Safe casts 4. Importance of nullability 5. TMI 1. Nullable types The problem of nullability is sometimes referred to as billion dollar mistake. `NullPointerException` is really hard to fix. Modern approach: to make NPE compile-time error, not run-time error 코틀린은 nullable types과 non-nullable types을 구분한다. val s1: String = alwa..