FileMemoryCache.swift

func set(_ data: DispatchData, byteRange: CountableRange<Int>) {        
  if let insertionIndex = sortedItems.firstIndex(where: { $0.byteRange.startIndex >= byteRange.startIndex }) {
    let canDiscard: Bool = {
      guard !sortedItems[insertionIndex].byteRange.contains(byteRange) else { return true }
      guard insertionIndex > sortedItems.startIndex else { return false }
      return sortedItems[insertionIndex.advanced(by: -1)].byteRange.contains(byteRange)
    }()
    if !canDiscard {
      sortedItems.insert(StorageItem(byteRange: byteRange, data: data), at: insertionIndex)
    }
  }
  else {
    sortedItems.append(StorageItem(byteRange: byteRange, data: data))
  }
}