When subtypes are overlapping, an additional field must be added to the supertype to act as a discriminator.

Name: When subtypes are overlapping, an additional field must be added to the supertype to act as a discriminator.
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Quizplus · Accepted Answer

When subtypes are overlapping, a discriminator field is not necessary because an instance can belong to multiple subtypes simultaneously. Discriminators are used when subtypes are mutually exclusive.

When Subtypes Are Overlapping, an Additional Field Must Be Added