R Under development (unstable) (2024-09-02 r87090 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(rgrass))
> if (requireNamespace("terra", quietly = TRUE)) {
+   f <- system.file("ex/elev.tif", package = "terra")
+   SG <- terra::rast(f)
+   if (packageVersion("terra") < "1.7.46") {
+     bb <- getMethod("ext", "SpatRaster")(SG)@ptr$vector
+     all.equal(bb, as.vector(getMethod("ext", "SpatRaster")(SG)))
+   } else {
+     bb <- as.vector(getMethod("ext", "SpatRaster")(SG))
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   5.01    0.25    5.21