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)
> y = st_set_dimensions(x, "band", point = TRUE)
> y[,1:10, 1:10, c(1,4,3,2)]
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median   Mean 3rd Qu. Max.
L7_ETMs.tif    25      45     57 56.535      64   97
dimension(s):
     from to  offset delta                     refsys point  values x/y
x       1 10  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [x]
y       1 10 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [y]
band    1  4      NA    NA                         NA  TRUE 1,...,2    
> y = st_set_dimensions(x, "band", point = NA)
> y[,1:10, 1:10, c(1,4,3,2)]
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median   Mean 3rd Qu. Max.
L7_ETMs.tif    25      45     57 56.535      64   97
dimension(s):
     from to  offset delta                     refsys point          values x/y
x       1 10  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE            NULL [x]
y       1 10 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE            NULL [y]
band    1  4      NA    NA                         NA    NA [1,2),...,[2,3)    
> y = st_set_dimensions(x, "band", point = FALSE)
> y[,1:10, 1:10, c(1,4,3,2)]
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median   Mean 3rd Qu. Max.
L7_ETMs.tif    25      45     57 56.535      64   97
dimension(s):
     from to  offset delta                     refsys point          values x/y
x       1 10  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE            NULL [x]
y       1 10 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE            NULL [y]
band    1  4      NA    NA                         NA FALSE [1,2),...,[2,3)    
> y = st_set_dimensions(x, "band", values = letters[1:6])
> y[,1:10, 1:10, c(1,4,3,2)]
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median   Mean 3rd Qu. Max.
L7_ETMs.tif    25      45     57 56.535      64   97
dimension(s):
     from to  offset delta                     refsys point  values x/y
x       1 10  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [x]
y       1 10 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [y]
band    1  4      NA    NA                         NA    NA a,...,b    
> y = st_set_dimensions(x, "band", values = letters[1:6], point = NA)
> y[,1:10, 1:10, c(1,4,3,2)]
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median   Mean 3rd Qu. Max.
L7_ETMs.tif    25      45     57 56.535      64   97
dimension(s):
     from to  offset delta                     refsys point  values x/y
x       1 10  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [x]
y       1 10 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [y]
band    1  4      NA    NA                         NA    NA a,...,b    
> y = st_set_dimensions(x, "band", values = letters[1:6], point = TRUE)
> y[,1:10, 1:10, c(1,4,3,2)]
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median   Mean 3rd Qu. Max.
L7_ETMs.tif    25      45     57 56.535      64   97
dimension(s):
     from to  offset delta                     refsys point  values x/y
x       1 10  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [x]
y       1 10 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE    NULL [y]
band    1  4      NA    NA                         NA  TRUE a,...,b    
> 
> proc.time()
   user  system elapsed 
   1.18    0.18    1.37