* hash.c (rb_hash_aset): string key copying only happen if key is

  an exact instance of String, not a subclass. based on a patch
  from Mike Gold <mike.gold.4433 at gmail.com> in [ruby-talk:322667].
  [incompatible] [ruby-talk:322417]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@20860 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 044964c809..f3bd0b66b8 100644
--- a/hash.c
+++ b/hash.c
@@ -984,7 +984,7 @@ rb_hash_aset(VALUE hash, VALUE key, VALUE val)
 {
     rb_hash_modify(hash);
     if (RHASH(hash)->ntbl->type == &identhash ||
-	TYPE(key) != T_STRING || st_lookup(RHASH(hash)->ntbl, key, 0)) {
+	rb_obj_class(key) != rb_cString || st_lookup(RHASH(hash)->ntbl, key, 0)) {
 	st_insert(RHASH(hash)->ntbl, key, val);
     }
     else {