R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  m o d . R  tests
> ##
> 
> mod <- pracma::mod
> rem <- pracma::rem
> 
> identical(mod(0, 0), 0)
[1] TRUE
> identical(mod(1, 0), 1)
[1] TRUE
> identical(mod(0, 2), 0)
[1] TRUE
> identical(mod(5, 3), 2)
[1] TRUE
> identical(mod(5, -3), -1)
[1] TRUE
> identical(mod(-5, 3), 1)
[1] TRUE
> identical(mod(-5, -3), -2)
[1] TRUE
> 
> identical(rem(0, 0), NaN)
[1] TRUE
> identical(rem(1, 0), NaN)
[1] TRUE
> identical(rem(0, 2), 0)
[1] TRUE
> identical(rem(5, 3), 2)
[1] TRUE
> identical(rem(5, -3), 2)
[1] TRUE
> identical(rem(-5, 3), -2)
[1] TRUE
> identical(rem(-5, -3), -2)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.14    0.03    0.15