PS Adapter Export does not serialize enums correctly

Prerequisites

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Summary

I've added the static Export() method to my class-based resources and have Ensure as an enum. When running dsc export the enum gets converted into the numeric value instead of the string value.

$schema: https://aka.ms/dsc/schemas/v3/bundled/config/document.json
contentVersion: 1.0.0
resources:
- type: AnyPackageDsc/Package
  name: AnyPackageDsc/Package-0
  properties:
    result:
    - Version: 3.12.2140.44225
      Prerelease: false
      Provider: AnyPackage.Msi\Msi
      Source: C:\WINDOWS\Installer\3fc3c86b.msi
      Latest: false
      Ensure: 1
      Name: Microsoft Visual Studio Setup WMI Provider
      Reasons: null
      AdditionalParameters: {}

Steps to reproduce

Create DSC class based resource with an enum.

Expected behavior

Enums use the string value

Actual behavior

Enums use the numeric value

Error details

Environment data

7.6-preview 4

Version

3.0.1

Visuals

No response

Start by reproducing the issue with dsc export on a class-based resource containing an enum, using PowerShell 7.6-preview 4 and DSC 3.0.1. Trace the PS Adapter export path and verify that Ensure is serialized as its string value rather than its numeric value; add or update coverage for this scenario if the repository has a matching test location.