struct ColumnsDataCache: Equatable {
  let data: [[BooruPost]]
  let columnCount: Int
  let posts: [BooruPost]

  static func == (lhs: Self, rhs: Self) -> Bool {
    guard lhs.columnCount == rhs.columnCount else { return false }
    guard lhs.posts.count == rhs.posts.count else { return false }
    guard !lhs.posts.isEmpty, !rhs.posts.isEmpty else {
      return lhs.posts.isEmpty == rhs.posts.isEmpty
    }
    guard lhs.posts.first?.id == rhs.posts.first?.id else { return false }
    guard lhs.posts.last?.id == rhs.posts.last?.id else { return false }

    return true
  }
}