PageBuilder泛型问题

之前1.17.5分支上PageBuilder有泛型，
typedef PageBuilder = Widget Function(
String pageName, Map params, String uniqueId);
但是在1.22分支上又没有了，你们之后是怎么弄？加泛型还是之后不加了？不然现在注册的页面越来越多，改一遍很麻烦
typedef Widget PageBuilder(String pageName, Map params, String uniqueId);

Start at the PageBuilder typedef and page-registration entry points in the 1.17.5 and 1.22 branches, then compare their generic and non-generic signatures. The issue needs a decided compatibility direction before implementation; done would mean the selected API behavior is documented and covered by the relevant existing tests.

Written by the indexing model from the issue text.