title: How to properly store array inside of a Record
body: <p>var z = Record({a: []});</p>
  
  <pre><code>var a = new z({a: [1]});
  var b = new z({a: [1]});
  expect(Immutable.is(a, b)).to.be.true; // false
  </code></pre>
  
  <p>This returns <strong>false</strong> because <strong>[]</strong> is a mutable structure. So I've changed that code into this:</p>
  
  <pre><code>var z = Record({a: List()});
  
  var a = new z({a: List([1])});
  var b = new z({a: List([1])});
  expect(Immutable.is(a, b)).to.be.true; // true
  </code></pre>
  
  <p>And it seems to work since <strong>Immutable.List</strong> is immutable. So is this the properly way of storing an array inside of a Record?</p>
  
  <p>Thank you!</p>