Unicode: Properly handle multi-byte emoji with hyperblocks

src/threads.js

@@ -4344,15 +4344,16 @@ Process.prototype.reportStringSize = function (data) {
 };
 
 Process.prototype.reportUnicode = function (string) {
-    var str;
+    var str, unicodeList;
 
     if (this.enableHyperOps) {
         if (string instanceof List) {
             return string.map(each => this.reportUnicode(each));
         }
         str = isNil(string) ? '\u0000' : string.toString();
-        if (str.length > 1) {
-            return this.reportUnicode(new List(Array.from(str)));
+        unicodeList = Array.from(str);
+        if (unicodeList.length > 1) {
+            return this.reportUnicode(new List(unicodeList));
         }
     } else {
         str = isNil(string) ? '\u0000' : string.toString();