Returns true if the two objects have the same values

const circleA = { radius: 10, x: 5, y: 5 };
const circleB = { radius: 10, x: 5, y: 5 };

circleA === circleB; // false, because identity of objects is different
Circles.isEqual(circleA, circleB); // true, because values are the same

Circles must both be positioned or not.