See the last paragraph about swapping from a dict/TOML-table to a list. The order of environments in that list would be the user-defined/well-defined order.

SG I think One challenge here is if we do want to keep it that RE can work when n=0 for RE targets. I think it's actually pretty nonsensical to have n=0 though -- it's almost certain that your localhost environment settings should be different than the RE settings. Thoughts?