R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> library("matrixStats")
> 
> signTabulate0 <- function(x, ...) {
+   nneg <- sum(x < 0, na.rm = TRUE)
+   nzero <- sum(x == 0, na.rm = TRUE)
+   npos <- sum(x > 0, na.rm = TRUE)
+   nna <- sum(is.na(x))
+   nneginf <- sum(is.infinite(x) & x < 0, na.rm = TRUE)
+   nposinf <- sum(is.infinite(x) & x > 0, na.rm = TRUE)
+   res <- c(nneg, nzero, npos, nna, nneginf, nposinf)
+   res <- as.double(res)
+   names(res) <- c("-1", "0", "+1", "NA", "-Inf", "+Inf")
+   if (is.integer(x)) res <- res[1:4]
+   res
+ } # signTabulate0()
> 
> 
> # Simulate data
> set.seed(0xBEEF)
> n <- 100L
> x <- runif(n)
> x[sample(n, size = 0.1 * n)] <- 0
> x[sample(n, size = 0.1 * n)] <- NA_real_
> x[sample(n, size = 0.1 * n)] <- -Inf
> x[sample(n, size = 0.1 * n)] <- +Inf
> 
> # Doubles
> message("Doubles:")
Doubles:
> counts0 <- signTabulate0(x)
> print(counts0)
  -1    0   +1   NA -Inf +Inf 
   9    7   77    7    9   10 
> counts1 <- signTabulate(x)
> print(counts1)
  -1    0   +1   NA -Inf +Inf 
   9    7   77    7    9   10 
> stopifnot(identical(counts1, counts0))
> 
> # Integers
> message("Integers:")
Integers:
> x <- suppressWarnings(as.integer(x))
> counts0 <- signTabulate0(x)
> print(counts0)
-1  0 +1 NA 
 0 74  0 26 
> counts1 <- signTabulate(x)
> print(counts1)
-1  0 +1 NA 
 0 74  0 26 
> stopifnot(identical(counts1, counts0))
> 
> proc.time()
   user  system elapsed 
   0.12    0.06    0.17