I did my searching and querying on this and found a solution. I didnt realize the commit number
found it the commit history on github could be used as a checkout tag. I was able
to look through the history and find out which commit created 3.8.6.
with that i did
git checkout c41a4f603af0fd018410ff805fbb1ef01d0a3a93 -b my_3.8.6