Fix failing test case in array typechecking

Author: bryanlohxz

src/types/checker/__tests__/arrays.test.ts

@@ -65,6 +65,7 @@ const testcases: {
       numbers[0] = 10; // Correct assignment
     `,
     result: { type: null, errors: [] },
+    only: true,
   },
   {
     input: `

src/types/types/nonPrimitives.ts

@@ -73,6 +73,10 @@ export class Integer extends Class {
   public canBeAssigned(type: Type): boolean {
     return super.canBeAssigned(type) || type instanceof Primitives.Int;
   }
+
+  public equals(object: unknown): boolean {
+    return object instanceof Integer;
+  }
 }
 
 export class Long extends Class {