Few years ago I took the first release of WP and made it compatible with last PHP version just to figure out if it was still working (was looking for a light wordpress at that time).
Could be a good idea to make a WP version 0.71-gold-PHP7 available !

https://wordpress.org/download/releases/#branch-071 to https://wordpress.org/download/releases/#branch-22 are all dated 24 september 2007 which is wrong