R version 4.4.0 Under development (unstable) (2006-00-00 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2006 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

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> options("rgdal_show_exportToProj4_warnings"="none")
> library(sp)
> 
> g = SpatialGrid(GridTopology(c(0,0), c(1,1), c(3,3)))
> p = as(g, "SpatialPolygons")
> over(g,g)
1 2 3 4 5 6 7 8 9 
1 2 3 4 5 6 7 8 9 
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.76    0.23    0.93