R Under development (unstable) (2025-02-18 r87748 ucrt) -- "Unsuffered Consequences"
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> library(flint)
> 
> args. <- list(from = 3L, to = -4L, by = -0.5, length.out = 8L)
> args  <- mapply(as, args., c("slong", "slong", "fmpq", "ulong"),
+                 SIMPLIFY = FALSE)
> 
> usage <- list(c(                    "length.out"),
+               c("from", "to"                    ),
+               c(              "by", "length.out"),
+               c("from", "to", "by"              ),
+               c("from", "to",       "length.out"),
+               c("from",       "by", "length.out"),
+               c(        "to", "by", "length.out"))
> value <- rep(c("ulong", "fmpz", "fmpq"), c(1L, 1L, 5L))
> 
> for (i in seq_along(usage)) {
+     u <- usage[[i]]
+     v <- value[[i]]
+     s <- as(do.call(seq.int, args.[u]), v)
+     stopifnot(flintIdentical(do.call(seq.int, args[u]), s),
+               flintIdentical(do.call(seq    , args[u]), s))
+ }
> 
> d <- 4L
> nvec. <- d:1L
> from. <- seq.int(from = 1L, by = d + 1L, length.out = d)
> s <- as(sequence(nvec = nvec., from = from.), "ulong")
> stopifnot(flintIdentical(sequence(nvec = as(nvec., "ulong"),
+                                   from = as(from., "ulong")),
+                          s),
+           all(s == which(.row(c(d, d)) >= .col(c(d, d)))))
> 
> proc.time()
   user  system elapsed 
   0.73    0.17    0.89