test: Check what happens on a failing test

src/number/__test__/Number.spec.js

@@ -0,0 +1,11 @@
+import assert from 'assert'
+import {Number} from '../Number.js'
+
+describe('Number Type', () => {
+   it('correctly recognizes numbers', () => {
+      assert(Number.test(3))
+      assert(Number.test(NaN))
+      assert(Number.test(Infinity))
+      assert(Number.test("3"))
+   })
+})