Explain the concept and benefits of using the 'readonly' modifier in TypeScript classes or interfaces.

Instruction: Provide a detailed explanation and example code to illustrate your answer.

Context: This question assesses the candidate's understanding of immutability in TypeScript's classes and interfaces and their ability to apply the 'readonly' modifier to ensure properties are not changed after their initial assignment.

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Thank you for posing such an insightful question. The concept of the readonly modifier in TypeScript is both fundamental and powerful when designing software that's robust and predictable. Let me clarify the concept first, then I'll dive into its benefits and provide a practical example to illustrate how it works within the context of either classes or interfaces...

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