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Alternatively, is interpolation (using variables) supported in stack config files?
e.g.
```# Pulumi.mystack.yaml
config:
  myvar: myvalue
  myvar2: "something-${myvar}"```

I don’t believe fallback values are possible for variables. If you are getting your values from `confg`, that does support a `default` argument: <https://www.pulumi.com/docs/concepts/projects/project-file/#schemas>.