public boolean inRegion(Position pos) {
        Objects.requireNonNull(pos, "pos");
        return pos.toVector().distanceSquared(this.center.toVector()) < this.radius * this.radius;
    }
Determines if the specified {@link Position} is within the region
@param pos target position
@return true if the position is in the region
helper/src/main/java/me/lucko/helper/serialize/CircularRegion.java