Set seed to null by default

lib/random/random.js

@@ -8,9 +8,12 @@ const logger = require('../logging')
 class random {
   /**
    * Must be called before any other methods can be called to initialize MersenneTwister
-   * @param {number} seed - Value to initialize MersenneTwister
+   * @param {?number} seed - Value to initialize MersenneTwister
    */
-  static init (seed = new Date().getTime()) {
+  static init (seed = null) {
+    if (seed === null) {
+      seed = new Date().getTime()
+    }
     random.twister = new MersenneTwister()
     random.twister.seed(seed)
   }