lazy method
Creates a lazy validator that defers instantiation until first use.
Note: This wraps the current validator. For deferred construction,
use Validate.lazy(() => expensiveValidator()) instead.
final lazy = emailRule.lazy();
lazy.validate('test'); // Runs validation
lazy.validate('test'); // Runs validation (no caching)
Implementation
LazyFormix<T, E> lazy() => LazyFormix(() => this);