If an environment defines:

pulumiConfig:
   foo:
     bar: 2

and then a stack’s .yaml file defines:

environment:
  - myEnv
config:
  foo:
    baz: 2

will the effective config have both

foo.bar

and

foo.baz

, or will the stack config overwrite

foo

and only give me

foo.baz

I would expect the former (a merge of the two objects)

appears to be the case, thanks Komal!