rio-tiler
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[Not ready] add warning when mixing nodata/mask/alpha
ref #401
let first see how https://github.com/mapbox/rasterio/issues/2233 goes
The rasterio issue was marked as Non-Fix so we'll raise a warning here
I'm seeing a 10ms time increase using this branch (~40ms instead of 30ms). Locally using gdal 3.3.2 and rasterio sources I don't see any difference 🤷♂️
Because this PR just adds a warning I will not merge it for now.