Unexpected 'nodes' handling when using a list of values

Launching /nix/store/s731nki30wda1c7gcg6bv354sa88pfmv-unit with a genConf.nodes = [ 1 2 ] garlic does not give any error an creates an invalid sbatch job /nix/store/3q3sjbzsk4fwbcwsji9lc4309bvsklww-sbatch/job

...
#SBATCH --nodes=1 2
...