docs: function getDataRegistry(identifier) {
    assert(!identifier || (typeof identifier === 'string'), `Invalid identifier specified: ${identifier}`);
  
    if (!window.__private__) window.__private__ = {};
    if (window.__private__.dataRegistry === undefined) window.__private__.dataRegistry = {};
  
    if (identifier)
      return namespace(identifier, window.__private__.dataRegistry);
    else if (identifier === null)
      return null
    else
      return window.__private__.dataRegistry;
  }