support logging "duck typed" Error objects

Author: terencehonles

src/utility.js

@@ -411,7 +411,9 @@ function createItem(args, logger, notifier, requestKeys, lambdaContext) {
         break;
       case 'object':
       case 'array':
-        if (arg instanceof Error || (typeof DOMException !== 'undefined' && arg instanceof DOMException)) {
+        if (arg instanceof Error
+            || (typeof DOMException !== 'undefined' && arg instanceof DOMException)
+            || (typ === 'object' && arg.name && arg.message)) {
           err ? extraArgs.push(arg) : err = arg;
           break;
         }
@@ -429,7 +431,9 @@ function createItem(args, logger, notifier, requestKeys, lambdaContext) {
         custom ? extraArgs.push(arg) : custom = arg;
         break;
       default:
-        if (arg instanceof Error || (typeof DOMException !== 'undefined' && arg instanceof DOMException)) {
+        if (arg instanceof Error
+            || (typeof DOMException !== 'undefined' && arg instanceof DOMException)
+            || (typ === 'object' && arg.name && arg.message)) {
           err ? extraArgs.push(arg) : err = arg;
           break;
         }