1 files changed, 1 insertions, 0 deletions
diff --git a/src/utility.js b/src/utility.js
index 1ebbe526..40b16a97 100644
--- a/src/utility.js
+++ b/src/utility.js
@@ -256,6 +256,7 @@ function set() {
   }
   return ret;
 }
+var unset = keys;
 
 function setSub(x, y) {
   var ret = set(keys(x));