new Miller()
The Miller cylindrical projection is a modified Mercator projection, proposed by Osborn Maitland Miller in 1942. Compared to Mercator, the vertical exaggeration of polar areas is smaller, so the relative size of areas is more correct.
Highcharts used this as the default map projection for world maps until the Map Collection v2.0 and Highcharts v10.0, when projection math was moved to the client side and EqualEarth chosen as the default world map projection.