map.getBounds().getNorthEast();          // LatLng(52.5262, 13.44907)

map.getPixelBounds().getTopRight();      // Point(2253845, 1375425) ???

map.getPixelOrigin();                    // Point(2252165, 1375425) ???

L.Projection.SphericalMercator.project(
    map.getBounds().getNorthEast()
);                                       // Point(0.23473, 1.08117) !?!

L.point(
    L.Projection.SphericalMercator.project(
        map.getBounds().getNorthEast()
    ).x * 6378137.0,
    L.Projection.SphericalMercator.project(
        map.getBounds().getNorthEast()
    ).y * 6378137.0
);                                       // Point(1497143.40914, 6895833.38915)