Cerbos is the open core, language-agnostic, scalable authorization solution that makes user permissions and authorization simple to implement and manage.

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Hey :wave: , I have been evaluating the tool today - looks really cool! One basic question: when using the principal attributes as a condition expression I can't get the "in" operator to work? here is the code:
```---
apiVersion: api.cerbos.dev/v1
resourcePolicy:
  resource: album
  version: default
  rules:
    - actions: ['view']
      effect: EFFECT_ALLOW
      roles:
        - editor
      condition:
        match:
          expr: 'test' in request.principal.attr.products```
and response
`failed to convert YAML to JSON: yaml: line 12: did not find expected key`

Hey,

There is an issue with using `'` at the start of an expression - you can break out onto a new line as follows which works

```---
apiVersion: api.cerbos.dev/v1
resourcePolicy:
  resource: album
  version: default
  rules:
    - actions: ['view']
      effect: EFFECT_ALLOW
      roles:
        - editor
      condition:
        match:
          expr: &gt;
            'test' in request.principal.attr.products```