tableLookup function was returning a string

tableLookup function was returning a string instead of number

app/imports/parser/functions.js

@@ -106,7 +106,7 @@ export default {
     fn: function tableLookup(arrayNode, number){
       for(let i in arrayNode.values){
         let node = arrayNode.values[i];
-        if (node.value > number) return i;
+        if (node.value > number) return Number(i);
       }
       return arrayNode.values.length;
     }