I sit between your domain model and the cold, cruel world.
Nested collections or objects, like
r.obj :contactin the example above. Should create a new mediator stack for each entry in the collection but somehow mark the current mediator as the parent.
r.ids, just value.map(&:id). Should check for
_idsshortcut first though, but only if an explicit value isn't provided.
Nested collections should always exist in rendered output even if they're empty or missing.
Benchmarks and micro-opts, esp. around object allocation.
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