How to restrict camera to circle bounds?

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I am trying to migrate from 6.3 to 10.
I need to restrict camera moves inside circle with given center and radius.

In 6.3 I wrote:

func mapView(_ mapView: MGLMapView, shouldChangeFrom oldCamera: MGLMapCamera, to newCamera: MGLMapCamera) -> Bool {
guard let c = mapCenter else { // my property containing center coordinate
return true
}
let l1 = CLLocation(latitude: newCamera.centerCoordinate.latitude,
longitude: newCamera.centerCoordinate.longitude)
let l2 = CLLocation(latitude: c.latitude,
longitude: c.longitude)
let meters = l1.distance(from: l2)
if meters > MAX_DISTANCE_METERS {
return false
}
boundingView.cutoutCenter = mapView.convert(c, toPointTo: boundingView) //set view with transparent circle property
return true
}

See video how it looks: https://disk.yandex.ru/i/7pVgwGnf48myKg

I need to do the same in 10 version.

CameraBoundsOptions allows me restrict camera to rectangle, but I need cirle. Using rectange close to circle is not satisfactory solution.

Start by reading the migration context from Mapbox Maps iOS 6.3 to 10 and the CameraBoundsOptions API. Compare its rectangular restriction with the earlier shouldChangeFrom camera delegate shown in the issue, then determine whether circular bounds are supported. Done means camera movement is restricted to the specified center and radius rather than an enclosing rectangle.

Written by the indexing model from the issue text.