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trying to use autonaming i get into weird requirement of snake_case for specific gcloud types

```config:
  pulumi:autonaming:
    value:
      pattern: ${stack}-${config.region}-${name}-${hex(4)}
      providers:
        gcp:
          resources:
              gcp:projects/iAMCustomRole:IAMCustomRole:
                pattern: ${stack}_${config.region}_${name}_${hex(4)}```
```error: gcp:projects/iAMCustomRole:IAMCustomRole resource 'common_iam_dev' has a problem: "role_id" ("local_us-west3_common_iam_dev_d822") doesn't match regexp "^[a-zA-Z0-9_\\.]{3,64}$". Examine values at 'common_iam_dev.roleId'.```
Basically, the config.region = `us-west3` , anyway to snake case it to `us_west3`  ?