Hi Masahiko,
Thanks for digging into the older cases.
I started a thread for master in [1]. It tries each stored setting
on the new cluster. That covers both of your examples and Adesh's
GRANT SET case.
[1]
https://postgr.es/m/CAGRkXqRzM-68S9OhtLsTscZ_hhpHhy=ArWCdmp5GxRxo+UBmig@mail.gmail.com
Thanks,
Shihao