terra_cells.md

library(terra)
a <- vect(cbind(c(0, 1), c(2, 3, 4)), type = "l")

## imagine we have an independently specificed raster, and this line falls in it somewhere
r <- extend(rast(a, res = .05), 1)

(cell <- cells(r, a))

##so we can do 
plot(a); points(xyFromCell(r, cell[, "cell", drop = TRUE]))
plot(as.polygons(crop(r, a)), add = TRUE, border = "red")

Note that the actual cell value is a unique that raster, that combination of xmin,xmax,ymin,ymax,ncol,nrow and nothing else.