Fix equal function when passing in an array

For example, `expect([1, 2, 3]).to.equal([1, 2, 3])` previously would
give the compilation error:

> Argument of type 'number[]' is not assignable to parameter of type 'number'.

types/code/code-tests.ts

@@ -103,6 +103,7 @@ expect("abcd").to.have.length(4);
 
 expect(5).to.equal(5);
 expect({ a: 1 }).to.equal({ a: 1 });
+expect([1, 2, 3]).to.equal([1, 2, 3]);
 
 expect(Object.create(null)).to.equal({}, { prototype: false });