making progress toward upgrading R htmlwidget leaflet to leafletjs v1.0.3 but discovered issues with addRasterImage. First set of issues now resolved, but still left with a couple more:
leaflet() %>% addTiles() %>% addRasterImage(poppendorf[[4]])
renders but is hidden underneath tileLayer - should be easy fix
mapview::viewRGB(poppendorf)
renders but when toggled in layerControl does not redraw canvas - will be a little more tricky.