Add set/get for requiresSecureCoding

Headers/Foundation/NSKeyedArchiver.h

@@ -270,6 +270,7 @@ extern "C" {
 #undef	GSIArray
 #endif
   NSZone	*_zone;		/* Zone for allocating objs.	*/
+  BOOL          _requiresSecureCoding;
 #endif
 #if     GS_NONFRAGILE
 #else
@@ -308,6 +309,18 @@ extern "C" {
  */
 + (id) unarchiveObjectWithFile: (NSString*)aPath;
 
+/**
+ * Returns whether the current instance of the archiver needs secure
+ * coding.
+ */
+- (BOOL) requiresSecureCoding;
+
+/**
+ * Sets whether the current instance of the archiver needs secure
+ * coding.
+ */
+- (void) setRequiresSecureCoding: (BOOL)flag;
+  
 /**
  * Returns class substituted for class name specified by aString when
  * encountered in the archive being decoded from, or nil if there is no
@@ -315,7 +328,7 @@ extern "C" {
  * translation map, which is searched on decoding if no match found here.
  */
 - (Class) classForClassName: (NSString*)aString;
-
+  
 /**
  * Sets class substituted for class name specified by aString when
  * encountered in the archive being decoded from, or nil if there is no

Source/NSKeyedUnarchiver.m

@@ -367,12 +367,12 @@ static NSMapTable	*globalClassMap = 0;
 
 - (BOOL)requiresSecureCoding
 {
-  return NO;
+  return _requiresSecureCoding;
 }
 
 - (void)setRequiresSecureCoding: (BOOL)secure
 {
-  return;
+  _requiresSecureCoding = secure;
 }
 
 - (Class) classForClassName: (NSString*)aString