Compositing vector tile layers

[klokan]

To serve combined layers with request like: "layer1,layer2" the mapnik must combine the tiles from more sources. Overzooming with variable scale / offset to get relevant part of vector tile is required.

http://mapnik.org/node-mapnik/documentation/3.5/#mapnik-vectortile/composite

UPDATE:
https://github.com/tnightingale/tilelive-vector-composite linked from
mapbox/mapbox-studio-classic#368 (comment)
and https://github.com/JesseCrocker/tilelive-merge