public static ReadOnlyCircleCollider2D AsReadOnly(this CircleCollider2D self) => self.IsTrulyNull() ? null : new ReadOnlyCircleCollider2D(self);
public static ReadOnlyCircleCollider2D AsReadOnly(this CircleCollider2D self) => self.IsTrulyNull() ? null : new ReadOnlyCircleCollider2D(self);