message: Fix ExtError construction
diff: @@ -47,8 +47,8 @@ export default class ExtError extends Error implements ExtErrorInterface {
  // These are actually done via extend below to clean them up
  this.code = code;
  this.data = data;
  - this.name = name;
  - this.message = message;
  + this.name = this.constructor.name;
  + this.message = String(message);
  this.stack = '';
  extend(this, 'message', String(message));
  