Bug: shallowCompare doesn't work if the objects have different keys

[GregoryPotdevin]

The current shallowCompare implementation doesn't work if the objects have different keys

You can try shallowCompare with the following code :

console.log(shallowCompare({ a: 1, b: 1 }, { a: 1 }));
console.log(shallowCompare({ a: 1 }, { a: 1, b: 1 }));

shallowCompare({ a: 1, b: 1 }, { a: 1 }) => true

This is because we only iterate on the keys of nextProps, ignoring any extra props in prevProps.