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is the engine able to convert from a `Target` subclass to some other non-target type if there is a rule defined for that conversion? can it do so if the rule is defined to take an applicable FieldSet as input and returns the destination type?

&gt; is the engine able to convert from a `Target` subclass to some other non-target type if there is a rule defined for that conversion?
yes: if you have a rule `convert_my_target(…: MyTarget) -&gt; NonTargetType` it would be invoked.

&gt; can it do so if the rule is defined to take an applicable FieldSet as input and returns the destination type?
i don’t see why not.

maybe your question is rooted in the subtyping bit though? `Target` subtypes are not provided by any rule in the graph currently, so you’d have to actually do the cast yourself and then  `await Get (NonTargetType, MyTarget(..))`

&gt; maybe your question is rooted in the subtyping bit though? 
Maybe what you mean: <@U0N6C2Q9F> one thing to be aware of is how the engine uses exact type IDs and does not respect subclassing. A rule that takes `Target` won't work because nothing in the repo has the type ID of `Target`. This is why we have `WrappedTarget` and field sets etc