R Under development (unstable) (2023-08-09 r84924 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(stars))
> 
> tif = system.file("tif/L7_ETMs.tif", package = "stars")
> (x = read_stars(tif))
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median     Mean 3rd Qu. Max.
L7_ETMs.tif     1      54     69 68.91242      86  255
dimension(s):
     from  to  offset delta                     refsys point x/y
x       1 349  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE [x]
y       1 352 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE [y]
band    1   6      NA    NA                         NA    NA    
> 
> # write stars object:
> write_stars(x, tempfile(), driver = "GTiff")
> 
> # write stars_proxy object:
> (x = read_stars(tif, proxy = TRUE))
stars_proxy object with 1 attribute in 1 file(s):
$L7_ETMs.tif
[1] "[...]/L7_ETMs.tif"

dimension(s):
     from  to  offset delta                     refsys point x/y
x       1 349  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE [x]
y       1 352 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE [y]
band    1   6      NA    NA                         NA    NA    
> write_stars(x, tempfile(), driver = "GTiff")

> 
> proc.time()
   user  system elapsed 
   1.03    0.17    1.20