• No random tests

• JS Node 18. with chai framework should be used

reusability/purity is not specified/tested: what should happen for a test like this ?

it('reusability', function() {
  const chain = lazyChain([1, 2, 3]);
  const once  = chain.invoke('map', x => x * x);
  const twice = chain.invoke('map', x => x * x);
  // [1, 16, 81] or [1, 4, 9] ?
  Test.assertSimilar(once.value(), [1, 4, 9]);
  Test.assertSimilar(twice.value(), [1, 4, 9]);
});