move safe index subscript to extension without generic constraints

Sources/Extensions/Array/Array+Extensions.swift

@@ -64,6 +64,10 @@ public extension Array where Element: Equatable {
         return filter { !allValues.contains($0) }
     }
 
+}
+
+public extension Array {
+
     // Subscript for safe access to element by index
     subscript(safe index: Index) -> Element? {
         return index < count ? self[index] : nil