Merge branch 'master' into pub_channel

package.json

@@ -1,6 +1,6 @@
 {
   "name": "centrifuge",
-  "version": "5.2.1",
+  "version": "5.2.2",
   "description": "JavaScript client SDK for bidirectional communication with Centrifugo and Centrifuge-based server from browser, NodeJS and React Native",
   "main": "build/index.js",
   "types": "build/index.d.ts",

src/fossil.ts

@@ -72,7 +72,8 @@ class Writer {
 
   // Copy from array at start to end.
   putArray(a: ByteArray, start: number, end: number) {
-    this.a.push(...a.slice(start, end));
+    // TODO: optimize.
+    for (let i = start; i < end; i++) this.a.push(a[i]);
   }
 }