Ask for raster overzoom from addProtocol handler

[wipfli]

Is it possible to ask MapLibre to overzoom a raster tile from inside an addProtocol handler?

My use case is that I have a tileset which goes in some areas to zoom 17 and in others only to zoom 12. Now I would like that MapLibre overzooms tiles that are in the area where I only have zoom 12 maxzoom data.

[HarelM]

I think you can return an error for tiles that doesn't deep and return the tiles for zoom 17 when you have them in the addProtocol method.
I haven't tried that, but I think it should work.
Maybe return 404 to make raster tiles overzoom, I don't remember, try it out and let me know.

[acalcutt]

In tileserver-gl I added a sparse feature per data source into the current pre-release, which sends a 410 error when tiles don't exist. this allows maplibre-js to request lower zoom tiles instead of sending back a blank image. This was based on discussion in #5692 and I am using it to test my sparse tile terrain dataset

In testing, before I had this new feature, I was doing like harel said with addprotocol, which was something like this
https://stackblitz.com/edit/web-platform-dgdaakxc?file=index.html

[wipfli]

Throwing an error inside add protocol seems to make maplibre request lower zoom tiles. But they only get painted after a pan or zoom interaction when the page is loaded fresh. Maybe I can do a repro...