Cmdstanr reduce sum case study, but: unused argument (threads = TRUE)

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thanks again !

I refreshed the case study Reduce Sum: A Minimal Example and reinstalled cmdstanr but cores and chains still does not work, so maybe I have an older version still ?

> library(cmdstanr)
This is cmdstanr version 0.0.0.9000
- Online documentation and vignettes at mc-stan.org/cmdstanr
- CmdStan path set to: /home/shira-rstudio/.cmdstanr/cmdstan-2.23.0
- Use set_cmdstan_path() to change the path

I tried my local machine and a cluster of cores, different values for num_chains, num_cores, num_threads (see my question about how to set these here), but I rarely get speed-up, and never anywhere close to the 2.7 speed-up in the case study.

I must be doing something silly ! thanks again for your help.