code: function processScope(scope) {
    if (!isObject(scope) || scope._bsontype === 'ObjectID') {
      return scope;
    }
  
    const keys = Object.keys(scope);
    let key;
    const new_scope = {};
  
    for (let i = keys.length - 1; i >= 0; i--) {
      key = keys[i];
      if ('function' === typeof scope[key]) {
        new_scope[key] = new Code(String(scope[key]));
      } else {
        new_scope[key] = processScope(scope[key]);
      }
    }
  
    return new_scope;
  }
docs: Functions that are passed as scope args must
  be converted to Code instances.
  @ignore