Off-by-one error in precondition:

for index <= position, if bytes.count == 0 and index == position, then we don't want this condition to be true at all.

Author: AZero13

Sources/Foundation/DispatchData+DataProtocol.swift

@@ -34,7 +34,7 @@ extension DispatchData : DataProtocol {
         }
 
         public subscript(position: DispatchData.Index) -> UInt8 {
-            precondition(index <= position && position <= index + bytes.count)
+            precondition(index <= position && position < index + bytes.count)
             return bytes[position - index]
         }