Update shallow equal objects

[Emanuele Stoppa]

I would to request to update the shallow equal for objects with the following one

https://github.com/reactjs/react-redux/blob/master/src/utils/shallowEqual.js

React-redux guys update it recently in order to use the shallowEqual they use in fbjs. This piece of code also manages number cases

[Misha Moroshko]

Could you describe the issue you are trying to solve, and provide a failing test please?

[Gray Zhang]

react-redux's implement actually uses the Object.is spec, the core difference is Object.is(0, -0) === false and Object.is(NaN, NaN) === true