R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library("matrixStats")
> 
> count_R <- function(x, value = TRUE, na.rm = FALSE, ...) {
+   if (is.na(value)) {
+     counts <- sum(is.na(x))
+   } else {
+     counts <- sum(x == value, na.rm = na.rm)
+   }
+   as.integer(counts)
+ }
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Data type: integer and numeric
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> for (mode in c("integer", "double")) {
+   x <- runif(20 * 5, min = -3, max = 3)
+   x[sample.int(length(x), size = 7)] <- 0
+   storage.mode(x) <- mode
+ 
+   for (na.rm in c(FALSE, TRUE)) {
+     # Count zeros
+     n0 <- count_R(x, value = 0, na.rm = na.rm)
+     n1 <- count(x, value = 0, na.rm = na.rm)
+     stopifnot(identical(n1, n0))
+     all <- allValue(x, value = 0, na.rm = na.rm)
+     any <- anyValue(x, value = 0, na.rm = na.rm)
+ 
+     # Count NAs
+     n0 <- count_R(x, value = NA, na.rm = na.rm)
+     n1 <- count(x, value = NA, na.rm = na.rm)
+     stopifnot(identical(n1, n0))
+     all <- allValue(x, value = NA, na.rm = na.rm)
+     any <- anyValue(x, value = NA, na.rm = na.rm)
+ 
+     if (mode == "integer") {
+       ux <- unique(as.vector(x))
+       n0 <- n1 <- integer(length(x))
+       for (value in ux) {
+         n0 <- n0 + count_R(x, value = value, na.rm = na.rm)
+         n1 <- n1 + count(x, value = value, na.rm = na.rm)
+         stopifnot(identical(n1, n0))
+       }
+       stopifnot(all(n0 == ncol(x)))
+     } # if (mode == "integer")
+ 
+   } # for (na.rm ...)
+ } # for (mode ...)
> 
> # All NAs
> na_list <- list(NA_integer_, NA_real_, NaN)
> for (na_value in na_list) {
+   x <- rep(na_value, times = 10L)
+   for (na.rm in c(FALSE, TRUE)) {
+     n0 <- count_R(x, na.rm = na.rm)
+     n1 <- count(x, na.rm = na.rm)
+     stopifnot(identical(n1, n0))
+ 
+     # Count NAs
+     n0 <- count_R(x, value = NA, na.rm = na.rm)
+     n1 <- count(x, value = NA, na.rm = na.rm)
+     stopifnot(identical(n1, n0))
+     any <- anyValue(x, value = NA, na.rm = na.rm)
+     all <- allValue(x, value = NA, na.rm = na.rm)
+     stopifnot(any)
+     stopifnot(all)
+   }
+ } # for (na_value ...)
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Data type: logical
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> x <- logical(length = 10L)
> x[3:7] <- TRUE
> 
> # Row/column counts
> for (na.rm in c(FALSE, TRUE)) {
+   n0 <- count_R(x, na.rm = na.rm)
+   n1 <- count(x, na.rm = na.rm)
+   stopifnot(identical(n1, n0))
+ 
+   n_true <- count(x, value = TRUE, na.rm = na.rm)
+   n_false <- count(x, value = FALSE, na.rm = na.rm)
+   stopifnot(n_true + n_false == ncol(x))
+ 
+   # Count NAs
+   n0 <- count_R(x, value = NA, na.rm = na.rm)
+   n1 <- count(x, value = NA, na.rm = na.rm)
+   stopifnot(identical(n1, n0))
+ }
> 
> proc.time()
   user  system elapsed 
   0.18    0.04    0.21