Maintenance API returns resource group name in lower-case

We've been working with version 2018-06-01-preview of the Maintenance API's (via v38.1.0 of the Azure SDK for Go) - and have noticed a bug where the Resource Group name that's returned from Azure is always lower-cased for the ID, regardless of the input case. For example if I create a Maintenance Configuration in the resource group `Group1` the ID for create will be:

```
/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/group1/providers/microsoft.maintenance/maintenanceconfigurations/mc1
```
when actually this should be:
```
/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/Group1/providers/microsoft.maintenance/maintenanceconfigurations/mc1
```
Would it be possible to update this API to return the Resource Group name in the correct case, rather than lower-casing it?

Thanks!

Start by locating the Maintenance API specification for version 2018-06-01-preview and compare its resource ID behavior with the Azure SDK for Go v38.1.0 example in the issue. Determine whether the lower-casing occurs in the service or generated client; done means the returned resource-group segment preserves the input case and the relevant specification or regression coverage reflects that behavior.

Written by the indexing model from the issue text.