A simplified version of deep-equal intended for comparing objects that are being serialized to/from JSON that:

1. Treats undefined as null as different (since they produce different JSON output)

2. Treats a missing property and an undefined property as equal (since they produce the same JSON output)

3. Only deals with POD for now since that's typically what you serialize and trying to deal other types like deep-equal does can lead to lots of unwanted dependencies.

   e.g. deep-equal has the following dependency chain:

   deep-equal -> is-regex -> has -> function-bind
   

   and function-bind does eval() (actually Function(<string>)) which causes problems for CSP.

Furthermore, this library is mostly tailored towards using browser APIs that are commonly available. It uses Object.is which IE doesn't support but none of our projects care about supporting IE.

In fact, if you're reading this, you probably shouldn't use it. It's basically just trying to compare the result of JSON.stringify() on two objects but allowing the order of keys to differ.