R Under development (unstable) (2024-03-24 r86185 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(stars))
> tif = system.file("tif/L7_ETMs.tif", package = "stars")
> r = read_stars(list(a = c(tif,tif), b = c(tif, tif)), proxy = TRUE)
> (xx = st_redimension(r, along = list(foo = 1:4)))
stars_proxy object with 1 attribute in 4 file(s):
$a.L7_ETMs.tif.a.L7_ETMs.tif.b.L7_ETMs.tif.b.L7_ETMs.tif
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/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    
foo     1   4       1     1                         NA    NA    
> (rr = c(xx, xx))
stars_proxy object with 2 attributes in 8 file(s):
$a.L7_ETMs.tif.a.L7_ETMs.tif.b.L7_ETMs.tif.b.L7_ETMs.tif
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/L7_ETMs.tif"

$a.L7_ETMs.tif.a.L7_ETMs.tif.b.L7_ETMs.tif.b.L7_ETMs.tif
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/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    
foo     1   4       1     1                         NA    NA    
> # st_as_stars(rr)
> (rrr = st_redimension(rr, along = list(bar = as.Date(c("2001-01-01", "2002-01-01")))))
stars_proxy object with 1 attribute in 8 file(s):
$a.L7_ETMs.tif.a.L7_ETMs.tif.b.L7_ETMs.tif.b.L7_ETMs.tif.a.L7_ETMs.tif.a.L7_ETMs.tif.b.L7_ETMs.tif.b.L7_ETMs.tif
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[7] "[...]/L7_ETMs.tif" "[...]/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    
foo     1   4          1        1                         NA    NA    
bar     1   2 2001-01-01 365 days                       Date    NA    
> (rr = c(a = xx, b = xx))
stars_proxy object with 2 attributes in 8 file(s):
$a
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/L7_ETMs.tif"

$b
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/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    
foo     1   4       1     1                         NA    NA    
> # st_as_stars(rr)
> (rrr = st_redimension(rr, along = list(bar = as.Date(c("2001-01-01", "2002-01-01")))))
stars_proxy object with 1 attribute in 8 file(s):
$a.b
[1] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[4] "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif" "[...]/L7_ETMs.tif"
[7] "[...]/L7_ETMs.tif" "[...]/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    
foo     1   4          1        1                         NA    NA    
bar     1   2 2001-01-01 365 days                       Date    NA    
> 
> proc.time()
   user  system elapsed 
   1.37    0.31    1.67