1 files changed, 5 insertions, 5 deletions
diff --git a/lib/scope.js b/lib/scope.js
index acc6fa25..eebedfd8 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -450,13 +450,13 @@ var base54 = (function() {
     var chars, frequency;
     function reset() {
         frequency = Object.create(null);
-        chars = string.split("");
-        chars.map(function(ch){ frequency[ch] = 0 });
+        chars = string.split("").map(function(ch){ return ch.charCodeAt(0) });
+        chars.forEach(function(ch){ frequency[ch] = 0 });
     }
     base54.consider = function(str){
         for (var i = str.length; --i >= 0;) {
-            var ch = str.charAt(i);
-            ++frequency[ch];
+            var code = str.charCodeAt(i);
+            if (code in frequency) ++frequency[code];
         }
     };
     base54.sort = function() {
@@ -473,7 +473,7 @@ var base54 = (function() {
     function base54(num) {
         var ret = "", base = 54;
         do {
-            ret += chars[num % base];
+            ret += String.fromCharCode(chars[num % base]);
             num = Math.floor(num / base);
             base = 64;
         } while (num > 0);