birthYear and deathYear must be positive integers; extracted shared validateYears() method for reuse in createPerson. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
birthYear and deathYear must be positive integers; extracted shared validateYears() method for reuse in createPerson. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>