R Under development (unstable) (2024-09-06 r87103 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library("matrixStats")
> 
> allocVector_R <- function(length, value = NA) {
+   x <- vector(mode = typeof(value), length = length)
+   if (!is.finite(value) || value != 0) x[] <- value
+   x
+ }
> 
> values <- list(
+   -1L, 0L, +1L, NA_integer_, .Machine$integer.max,
+   -1, 0, +1, NA_real_, NaN, -Inf, +Inf,
+   .Machine$double.xmin, .Machine$double.xmax,
+   .Machine$double.eps, .Machine$double.neg.eps,
+   FALSE, TRUE, NA
+ )
> 
> n <- 10L
> for (value in values) {
+   x0 <- allocVector_R(n, value = value)
+   x <- allocVector(n, value = value)
+   if (!identical(x, x0)) {
+     str(list(n = n, value = value, x = x, x0 = x0))
+     stopifnot(identical(x, x0))
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   0.29    0.04    0.32