R Under development (unstable) (2025-09-19 r88859 ucrt) -- "Unsuffered Consequences"
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> library(flint)
> 
> 
> X <- arb(pi)
> stopifnot(identical(Mid(X), arf(pi)))
> X2 <- X; Mid(X2) <- 2 * pi # gave error
> ## Error in q@dim :
> ##   no applicable method for `@` applied to an object of class "function"
> stopifnot(X2 == 2 * pi)
> 
> 
> Z <- acb(pi)
> Imag(Z) <- 1 # gave error
> ## Error in q@dim :
> ##   no applicable method for `@` applied to an object of class "function"
> stopifnot(Z == pi + 1i)
> 
> 
> (mZ <- Mid(Z)) # newly works
class "acf", length 1, address 00000225641F8CD0
[1] 3.141593e+0+1.000000e+0i
> stopifnot(is(mZ, "acf"), mZ == pi + 1i)
> 
> proc.time()
   user  system elapsed 
   0.51    0.04    0.54