Maximum bugs postgres version? - Mailing list pgsql-bugs

Hello there.

I have a strange question to ask.

Do you have an idea, which postgres version is the most buggy one??
I need to use postgres as an experimentation source for my project related
to static analysis, and would love to work upon the most buggy version of
Postgres.
I would be highly obliged to know the answer.

Thanks and regards,
Kunal Kalra.