In some places, I see `@rule`s taking in a

FieldSet

and in other places I see them taking in a

Request

. Is there a general consensus on which is preferred? Seems like those who pass in `FieldSet`s typically specify the

request_type

attribute while the other way around is to specify the

field_set_type

. Are they equivalent ways of doing things?

we use FieldSet for the goal plugin hooks - it's a way for us to know "Should I run on this target? If so, which implementation do I delegate to?" XRequest is much more generic