Merge pull request #1860 from megawac/memoize-lu

Only coerce address to a string once

Author: akre54

underscore.js

@@ -698,7 +698,7 @@
   _.memoize = function(func, hasher) {
     var memoize = function(key) {
       var cache = memoize.cache;
-      var address = hasher ? hasher.apply(this, arguments) : key;
+      var address = '' + (hasher ? hasher.apply(this, arguments) : key);
       if (!_.has(cache, address)) cache[address] = func.apply(this, arguments);
       return cache[address];
     };