|string> */ public function rules(): array { return [ 'annual_interest_rate' => ['sometimes', 'required', 'numeric', 'min:0', 'max:100'], 'loan_term_months' => ['sometimes', 'required', 'integer', 'min:1', 'max:600'], 'start_date' => ['sometimes', 'required', 'date'], 'original_amount' => ['sometimes', 'required', 'integer', 'min:0'], ]; } }