docs: public static TrustingNullnessAnalysis instance(Context context) {
      TrustingNullnessAnalysis instance = context.get(TRUSTING_NULLNESS_KEY);
      if (instance == null) {
        instance = new TrustingNullnessAnalysis();
        context.put(TRUSTING_NULLNESS_KEY, instance);
      }
      return instance;
    }