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))
> tol = 1e-6
> 
> x1 = 1:3
> x2 = 6:7
> x = c(pi, exp(1))
> s1 = fl(x1)
> s2 = fl(x2)
> 
> test = dbl(c(s1, s2))
> truth = c(x1, x2)
> stopifnot(all.equal(test, truth, tol=tol))
> 
> test = dbl(c(s1, x2))
> stopifnot(all.equal(test, truth, tol=tol))
> 
> test = c(s1, x2, x)
> truth = c(x1, x2, x)
> stopifnot(all.equal(test, truth, tol=tol))
> 
> proc.time()
   user  system elapsed 
   0.32    0.03    0.34