R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(float))
> set.seed(1234)
> tol=1e-6
> 
> same = function(test, truth) stopifnot(all.equal(test, truth, tol=tol))
> 
> x1 = matrix(-4:5, 5)
> s1 = fl(x1)
> y = 1L
> z = 1.0
> s2 = flrunif(5)
> 
> 
> test = dbl(sum(s1))
> truth = sum(x1)
> same(test, truth)
> 
> test = dbl(sum(s1, s2))
> truth = sum(x1, dbl(s2))
> same(test, truth)
> 
> test = dbl(sum(s1, y))
> truth = sum(x1, y)
> same(test, truth)
> 
> 
> 
> x2 = x1
> x2[3, 1] = NA_integer_
> x2[4, 2] = NA_integer_
> s2 = fl(x2)
> 
> test = dbl(sum(s2, na.rm=FALSE))
> truth = sum(x2, na.rm=FALSE)
> same(test, truth)
> 
> test = dbl(sum(s2, na.rm=TRUE))
> truth = sum(x2, na.rm=TRUE)
> same(test, truth)
> 
> proc.time()
   user  system elapsed 
   0.31    0.04    0.35