Create object from a library's Class returns Null

[dangbinghoo]

On Wednesday, 29 May 2019 at 02:42:23 UTC, Adam D. Ruppe wrote:
> Object.factory is pretty unreliable and has few supporters 
> among the developers. I wouldn't suggest relying on it and 
> instead building your own factory functions.

oh, that's bad news, but the hibernated library is using this 
feature. what should I do with this?