What is the role of the `Unwrap()` method in custom error types and how does it relate to handling specific errors?

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What is the role of the `Unwrap()` method in custom error types and how does it relate to handling specific errors?
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The `Unwrap()` method (returning an `error`) on a custom error type allows Go's error handling functions like `errors.Is` and `errors.As` to traverse the error chain. By implementing `Unwrap()`, your custom error can expose the underlying error, enabling you to check for specific nested errors.