R Under development (unstable) (2023-11-03 r85470 ucrt) -- "Unsuffered Consequences"
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> ## DON'T load lme4; test is to see if glmer.nb works when
> ## lme4 is not loaded
> 
> set.seed(101)
> dd <- data.frame(x=runif(200), f= rep(1:20, each=10))
> b <- rnorm(20)
> dd <- transform(dd, y = rnbinom(200, mu  = exp(1 + 2*x + b[f]), size = 2))
> g <- lme4::glmer.nb(y~x + (1|f), data = dd)
> stopifnot(inherits(g, "glmerMod"))
> 
> proc.time()
   user  system elapsed 
   2.59    0.14    2.71