Addresses comments

Author: protocol86

Example/Auth/Sample/UserInfoViewController.m

@@ -36,8 +36,8 @@
     @return The string form of the NSDate instance.
  */
 static NSString *stringFromDate(NSDate *date) {
-  if (!date || ![date isKindOfClass:[NSDate class]]) {
-    return @"";
+  if (!date) {
+    return @"nil";
   }
   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
   [dateFormatter setDateStyle:NSDateFormatterMediumStyle];

Firebase/Auth/Source/Public/FIRUserMetadata.h

@@ -16,11 +16,14 @@
 
 #import <Foundation/Foundation.h>
 
+#import "FIRAuthSwiftNameSupport.h"
+
 NS_ASSUME_NONNULL_BEGIN
 
 /** @class FIRUserMetdata
     @brief A data class representing the metadata corresponding to a Firebase user.
  */
+FIR_SWIFT_NAME(UserMetadata)
 @interface FIRUserMetadata : NSObject
 
 /** @property lastSignInDate