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Is your feature request related to a problem? Please describe.

A lot of policies don't make sense to run on create actions, because they test against the original record. eg. relates_to_actor_via. At the moment this will either raise a runtime error, or silently fail.

Describe the solution you'd like

If each built-in policy could define which action types it worked on, we could emit a compile-time warning if people write policies that don't make a lot of sense or will never pass on a create action.

Describe alternatives you've considered

No response

Additional context

No response