R Under development (unstable) (2025-02-18 r87748 ucrt) -- "Unsuffered Consequences"
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> library(flint)
> 
> p. <- c(0L, as.integer(cumprod(rep(c(1, 2), c(1L, 30L)))))
> x. <- c(-rev(p.), p.)
> 
> stopifnot(identical(format(.ulong(x = p.)),        format(p.)       ),
+           identical(format(.slong(x = x.)),        format(x.)       ),
+           identical(format( .fmpz(x = x.)),        format(x.)       ),
+           identical(format( .fmpq(x = x.)), paste0(format(x.), "/1")))
> 
> stopifnot(identical(format(.fmpq(num = c(-1L, -11L), den = c(11L, 1L))),
+                     c(" -1/11", "-11/ 1")),
+           identical(format(.fmpq(x = c(-0x1p-12, 0x1p-6))),
+                     c("-1/4096", " 1/  64")))
> 
> f10 <- function (b) format(.slong(x = b), base = abs(b))
> s <- c(0:9, LETTERS, letters); ms <- c(" 0", paste0("-", s[-1L]))
> stopifnot(all(vapply(  2:62 , f10, "") ==  "10"),
+           all(vapply(-(2:62), f10, "") == "-10"),
+           identical(format(.slong(x =   0:61 ), base = 62L),  s),
+           identical(format(.slong(x = -(0:61)), base = 62L), ms))
> 
> ## TODO: test floating-point types after deciding about trailing zeros
> 
> proc.time()
   user  system elapsed 
   0.64    0.09    0.73