Updated for Swift 5.6

Author: colemancda

Sources/DataConvertible.swift

@@ -69,8 +69,6 @@ internal protocol DataContainer: RandomAccessCollection where Self.Index == Int
 
     subscript(index: Int) -> UInt8 { get }
 
-    subscript(range: Range<Int>) -> Slice<Self> { get }
-    
     mutating func append(_ newElement: UInt8)
 
     mutating func append(_ pointer: UnsafePointer<UInt8>, count: Int)