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)
> 
> tol = 1e-6
> 
> x = crossprod(matrix(stats::rnorm(30), 10))
> xs = fl(x)
> y = 1:3
> ys = fl(y)
> 
> solve_xy = solve(x, y)
> 
> 
> 
> test = dbl(solve(xs))
> stopifnot(all.equal(test, solve(x), tol=tol))
> 
> test = dbl(solve(xs, ys))
> stopifnot(all.equal(test, solve_xy, tol=tol))
> 
> test = dbl(solve(xs, y))
> stopifnot(all.equal(test, solve_xy, tol=tol))
> 
> test = solve(xs, as.double(y))
> stopifnot(all.equal(test, solve_xy, tol=tol))
> 
> proc.time()
   user  system elapsed 
   0.29    0.04    0.32