Better internal var naming in order to avoid confusion.

Author: chrisfsampaio

Foundation/NSNumberFormatter.swift

@@ -12,10 +12,10 @@ import CoreFoundation
 public class NSNumberFormatter : NSFormatter {
 
     typealias CFType = CFNumberFormatterRef
-    internal var __cfObject: CFType?
-    internal var _cfObject: CFType {
+    internal var _currentCfFormatter: CFType?
+    internal var _cfFormatter: CFType {
         get {
-            if let obj = __cfObject {
+            if let obj = _currentCfFormatter {
                 return obj
             } else {
                 #if os(OSX) || os(iOS)
@@ -26,7 +26,7 @@ public class NSNumberFormatter : NSFormatter {
 
                 let obj = CFNumberFormatterCreate(kCFAllocatorSystemDefault, locale._cfObject, numberStyle)
                 _setFormatterAttributes(obj)
-                __cfObject = obj
+                _currentCfFormatter = obj
                 return obj
             }
         }
@@ -44,14 +44,14 @@ public class NSNumberFormatter : NSFormatter {
     // Even though NSNumberFormatter responds to the usual NSFormatter methods,
     //   here are some convenience methods which are a little more obvious.
     public func stringFromNumber(number: NSNumber) -> String? {
-        return CFNumberFormatterCreateStringWithNumber(kCFAllocatorSystemDefault, _cfObject, number._cfObject)._swiftObject
+        return CFNumberFormatterCreateStringWithNumber(kCFAllocatorSystemDefault, _cfFormatter, number._cfObject)._swiftObject
     }
 
     public func numberFromString(string: String) -> NSNumber? {
         var range = CFRange()
         let number = withUnsafeMutablePointer(&range) { (rangePointer: UnsafeMutablePointer<CFRange>) -> NSNumber? in
             let options = CFNumberFormatterOptionFlags.ParseIntegersOnly.rawValue
-            let result = CFNumberFormatterCreateNumberFromString(kCFAllocatorSystemDefault, _cfObject, string._cfObject, rangePointer, options)
+            let result = CFNumberFormatterCreateNumberFromString(kCFAllocatorSystemDefault, _cfFormatter, string._cfObject, rangePointer, options)
             return result?._nsObject
         }
         return number
@@ -64,7 +64,7 @@ public class NSNumberFormatter : NSFormatter {
     }
 
     internal func _reset() {
-        __cfObject = nil
+        _currentCfFormatter = nil
     }
 
     internal func _setFormatterAttributes(formatter: CFNumberFormatterRef) {