Improvement performance using for over zip

Author: Robert Pieta

Foundation/NSIndexSet.swift

@@ -116,8 +116,10 @@ open class NSIndexSet : NSObject, NSCopying, NSMutableCopying, NSSecureCoding {
             return false
         }
 
-        // Iterate over indexes to compare each
-        for (range, element) in zip(_ranges, indexSet.rangeView) {
+        // Iterate over indexes to compare each, prefer for over zip for better performance
+        for i in 0..<_ranges.count {
+            let range = _ranges[i]
+            let element = indexSet.rangeView[i]
             let elementLength = element.upperBound - element.lowerBound
 
             // Return false if the ranges do not match