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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> suppressPackageStartupMessages(library(float))
> set.seed(1234)
> 
> tester = function(s, x, fun)
+ {
+   test = dbl(fun(s, na.rm=TRUE))
+   truth = fun(x, na.rm=TRUE)
+   stopifnot(all.equal(test, truth, tol=tol))
+   
+   test = dbl(fun(s, na.rm=FALSE))
+   truth = fun(x, na.rm=FALSE)
+   stopifnot(all.equal(test, truth, tol=tol))
+ }
> 
> tol = 1e-6
> m = 5
> n = 3
> 
> x1 = matrix(stats::rnorm(m*n), m, n)
> x2 = x1
> x2[1, 1] = NA_real_
> x2[3, 2] = NaN
> 
> s1 = fl(x1)
> s2 = fl(x2)
> 
> 
> 
> tester(s1, x1, colSums)
> tester(s2, x2, colSums)
> 
> tester(s1, x1, rowSums)
> tester(s2, x2, rowSums)
> 
> tester(s1, x1, colMeans)
> tester(s2, x2, colMeans)
> 
> tester(s1, x1, rowMeans)
> tester(s2, x2, rowMeans)
> 
> proc.time()
   user  system elapsed 
   0.26    0.10    0.36