Function same

tests/js/quint.js:29–32

(a, b)

    if (x !== false) throw new Error(`'${x}' is not false`);
  },
  same(a, b)
  {
    if (a !== b) throw new Error(`'${a}' does not equal to '${b}'`);
  },
  arrayEqual(a, b)
  {
    if (JSON.stringify(a) !== JSON.stringify(b)) throw new Error(`'${a}' does not equal to '${b}'`);