Merge pull request #33 from janbehrens/master

bugfix: txn failing on large arrays

Author: Paul Korzhyk

lib/txn.js

@@ -123,8 +123,7 @@ export class Txn {
         });
     }
     mergeArrays(a, b) {
-        const res = a.slice();
-        res.push(...b);
+        const res = a.slice().concat(b);
         res.sort();
         return res.filter((item, idx, arr) => idx === 0 || arr[idx - 1] !== item);
     }

src/txn.ts

@@ -200,8 +200,7 @@ export class Txn {
     }
 
     private mergeArrays(a: string[], b: string[]) {
-        const res = a.slice();
-        res.push(...b);
+        const res = a.slice().concat(b);
         res.sort();
         // Filter unique in a sorted array.
         return res.filter(