Passing const values to a function results in a warning. We also cannot declare the function as accepting a const value (not sure if this is a good idea or not).

/* 
 * valac test.vala
 */

using GLib;

public class Test : GLib.Object {
	private static const int[] NUMBERS = {
		1, 2, 3
	};
	public static void test(int[] numbers) {

	}
	public static void main(string[] args) {
		test(NUMBERS);
	}
}

Compiler warning:

test.c: In function ‘test_main’:
test.c:23: warning: passing argument 1 of ‘test_test’ discards qualifiers from pointer target type