Improved performance of NSOrderedSet and NSSet with early exit

Author: Robert Pieta

Foundation/NSOrderedSet.swift

@@ -210,6 +210,10 @@ extension NSOrderedSet {
     }
 
     open func isSubset(of other: NSOrderedSet) -> Bool {
+        if count > other.count {
+            return false
+        }
+
         for item in self {
             if !other.contains(item) {
                 return false
@@ -219,6 +223,10 @@ extension NSOrderedSet {
     }
 
     open func isSubset(of set: Set<AnyHashable>) -> Bool {
+        if count > set.count {
+            return false
+        }
+
         for item in self {
             if !set.contains(item as! AnyHashable) {
                 return false

Foundation/NSSet.swift

@@ -208,6 +208,10 @@ extension NSSet {
     }
 
     open func isSubset(of otherSet: Set<AnyHashable>) -> Bool {
+        if count > otherSet.count {
+            return false
+        }
+        
         // `true` if we don't contain any object that `otherSet` doesn't contain.
         for item in self {
             if !otherSet.contains(item as! AnyHashable) {