<?php declare(strict_types = 1);

/**
 * @param array{page?: int, search?: string} $settings
 */
function test(array $settings = []): bool {
	$copy = [...$settings];
	\PHPStan\dumpType($copy); // Dumped type: array{page: int, search: string}
	\PHPStan\dumpType($settings); // Dumped type: array{page?: int, search?: string}
	return isset($copy['search']); // Offset 'search' on array{page: int, search: string} in isset() always exists and is not nullable.
}	

test();