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FAQ: Why Isn't Mutable a Subtype of Immutable, or Vice Versa?

The FAQ addresses the question of why mutable types are not considered subtypes of immutable types, or vice versa, in programming languages.

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Tracking sinceSeptember 19, 202615 source points
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PublishedSeptember 18, 2026FedericoSchonborn
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WHY IT MAY MATTER

This information is useful for developers understanding type hierarchies in programming languages.

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