Minor fix for autocreated object repeated fields and maps.

- If setting/clearing a repeated field/map that was objects, check the class
  before checking the autocreator.
- Just to be paranoid, don’t mutate within copy/mutableCopy for the autocreated
  classes to ensure there is less chance of issues if someone does something
  really crazy threading wise.
- Some more tests for the internal AutocreatedArray/AutocreatedDictionary
  classes to ensure things are working as expected.
- Add Xcode 8.2 to the full_mac_build.sh supported list.

1 files changed, 2 insertions, 2 deletions

diff --git a/objectivec/GPBArray.m b/objectivec/GPBArray.m
index ae57747d..f401631d 100644
--- a/objectivec/GPBArray.m
+++ b/objectivec/GPBArray.m
@@ -2519,14 +2519,14 @@ static BOOL ArrayDefault_IsValidValue(int32_t value) {
 
 - (id)copyWithZone:(NSZone *)zone {
   if (_array == nil) {
-    _array = [[NSMutableArray alloc] init];
+    return [[NSMutableArray allocWithZone:zone] init];
   }
   return [_array copyWithZone:zone];
 }
 
 - (id)mutableCopyWithZone:(NSZone *)zone {
   if (_array == nil) {
-    _array = [[NSMutableArray alloc] init];
+    return [[NSMutableArray allocWithZone:zone] init];
   }
   return [_array mutableCopyWithZone:zone];
 }