docs: function Base(options) {
    this.define('options', options || {});
    this.define('hints', this.hints || {});
    this.define('data', this.data || {});
    this.define('app', this.app || this.options.app || {});
    this.define('_cache', {});
    this.define('_callbacks', this._callbacks);
  
    if (typeof this.options.mixins === 'object') {
      this.visit('mixin', this.options.mixins);
    }
  }