IssueTracker

Component used: Safe Args
Version used: 1.0.0-alpha03

If I have an argument that is non-null, it is possible to construct a Args instance that still has that value as null by using:
    Bundle bundle = new Bundle();
    bundle.putString("value", null);

Since the fromBundle() method just checks for the existence of the key and does not confirm that the value in that key is truly not null:
    if (bundle.containsKey("value")) {
      result.value = bundle.getString("value");
    } else {
      throw new IllegalArgumentException("Required argument \"value\" is missing and does not have an android:defaultValue");
    }

It should throw an IllegalArgumentException if bundle.getString("value") in my example is null. The error message could read something like "Argument \"value\" is marked as non-null but was passed a null value"