test: add check for const number (#3538)

Author: Shinigami92

test/modules/helpers.spec-d.ts

@@ -45,11 +45,15 @@ describe('helpers', () => {
   });
 
   describe('maybe', () => {
-    it('const generic single element', () => {
-      // TODO @ST-DDT 2024-02-25: Check why this is detected as `number` instead of `1`
+    it('generic single element', () => {
       const actual = faker.helpers.maybe(() => 1);
       expectTypeOf(actual).toEqualTypeOf<number | undefined>();
     });
+
+    it('const generic single element', () => {
+      const actual = faker.helpers.maybe(() => 1 as const);
+      expectTypeOf(actual).toEqualTypeOf<1 | undefined>();
+    });
   });
 
   describe('objectKey', () => {