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    Valid slug can contain only lowercase alphanumeric characters and hyphens.
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    Examples:
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        # Output: True
        >>> slug('my.slug')
        # Output: ValidationError(func=slug, args={'value': 'my.slug'})

    Args:
        value: Slug string to validate.

    Returns:
        (Literal[True]): If `value` is a valid slug.
        (ValidationError): If `value` is an invalid slug.
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