Why is Composition with casts important in Laravel applications, and what problem does it solve for developers?

Why is Composition with casts important in Laravel applications, and what problem does it solve for developers? The key reason to understand composition with casts is that Laravel applications are usually composed of several layers that must work together predictably. Modern attribute APIs allow related casting and transformation behavior to be expressed in one place. Ignoring that boundary can lead to duplicated logic, poor security, unnecessary database work, or code that is difficult to test. Why it matters in practice: Eloquent attribute transformations let models present or normalize attribute values through reusable model-level logic. The specific focus here is composition with casts: Modern attribute APIs allow related casting and transformation behavior to be expressed in one place. This question is designed to test not only terminology, but also how the concept fits into Laravel's request, application, database, security, or deployment workflow.