https://github.com/ucan-wg/delegation/issues/5#issuecomment-2434713564 My understanding is that a few of those example are now incorrect/obsolete: String Index: as per @expede, indexing on strings is now disallowed, to match jq Optional Iterator, .[][]?: the spec says that iterator on arrays are no-op. It makes sense imho, as jq output multiple values with that, which we can't. Nested Iterator, .[][]: same reason