Is it acceptable making COPY format extendable?

Hi,

I'm proposing a patch that making COPY format extendable:
https://www.postgresql.org/message-id/20231204.153548.2126325458835528809.kou%40clear-code.com
https://commitfest.postgresql.org/48/4681/

It's based on the discussion at:
https://www.postgresql.org/message-id/flat/3741749.1655952719@sss.pgh.pa.us#2bb7af4a3d2c7669f9a49808d777a20d

> > > IIUC, you want extensibility in FORMAT argument to COPY command
> > > https://www.postgresql.org/docs/current/sql-copy.html. Where the
> > > format is pluggable. That seems useful.
>
> > Agreed.
>
> Ditto.


But my proposal stalled. It it acceptable the feature
request that making COPY format extendable? If it's not
acceptable, what are blockers? Performance?


Thanks,
-- 
kou