kill CLONESETUP and DUPSETUP
They are no longer how Object#clone/Object#dup are defined. In fact DUPSETUP is not used from anywhere. CLONESETUP has only one usage. Let's not expose them to extension libraries.
cf https://github.com/ruby/ruby/pull/4100#discussion_r563481718
Added by shyouhei (Shyouhei Urabe) almost 5 years ago
kill CLONESETUP and DUPSETUP
They are no longer how Object#clone/Object#dup are defined. In fact
DUPSETUP is not used from anywhere. CLONESETUP has only one usage.
Let's not expose them to extension libraries.
cf https://github.com/ruby/ruby/pull/4100#discussion_r563481718