null null null nullnull null null nullnull null null nullnull null null nullnull null null nullnull null null nullThe existing factorial challenge has some restrictions on the domain, performance, and banning built-ins. I opened a meta question about it a week ago, and as per the meta consensus, we decided to post a new vanilla factorial challenge. The sandboxed challenge is here.
Now the problem is: Should we close the old factorial challenge as a dupe of the new one?