R Under development (unstable) (2025-02-12 r87715 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(flint)
> 
> n <- 4L
> x. <- y. <- z. <- seq_len(n)
> names(y.) <- letters[    seq_len(n)]
> names(z.) <- letters[n + seq_len(n)]
> x <- .slong(x = x.)
> y <- .slong(x = y.)
> z <- .slong(x = z.)
> 
> stopifnot(identical(length(x), n),
+           flintIdentical(`length<-`(x, 1L),
+                          .slong(x = x.[1L])),
+           flintIdentical(`length<-`(y, 1L),
+                          .slong(x = y.[1L])),
+           flintIdentical(`length<-`(x, n + n),
+                          .slong(x = c(x., integer(n)))),
+           flintIdentical(`length<-`(y, n + n),
+                          .slong(x = c(y., integer(n)))),
+           identical(x@names, character(0L)),
+           identical(names(x), NULL),
+           identical(y@names, names(y.)),
+           identical(names(y), names(y.)),
+           flintIdentical(`names<-`(x, NULL), x),
+           flintIdentical(`names<-`(y, NULL), x),
+           flintIdentical(`names<-`(x, names(z.)), z),
+           flintIdentical(`names<-`(y, names(z.)), z),
+           flintIdentical(`names<-`(x, character(0L)),
+                          `names<-`(x, character(n))),
+           flintIdentical(`names<-`(x, "."),
+                          `names<-`(x, c(".", character(n - 1L)))))
> 
> proc.time()
   user  system elapsed 
   0.34    0.04    0.39