Getting Error: Lambda expects an array with 3 elements. Array contains 1

I’d do the filter before the paginate, so you don’t end up with variable-sized pages:

Map(
  Paginate(
    Filter(
      Intersection(
        Match(Index("by_room_type"), "single"),
        Match(Index("by_room_size"), "big")
      )
      Lambda(
        ["doc"],
        Let(
          {
            ref: Select("ref", Var("doc")),
            ts: Select("ts", Var("doc")),
            data: Select("data", Var("doc"))
          },
          Equals(Select("Price", Var("data")), "£700")
        )
      )
    )
  ),
  Lambda("ref", Get(q.Var("ref")))
)
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