mozilla/playdoh-lib — comment on commit 3dcaca3403bfdbc9026ac77a7f4200fcaa477258
File:  line 0
By Osmose:

The argument is that vendor should always point to playdoh-lib and update periodically to get the latest stuff for playdoh, and vendor-local is where you do exactly as you're recommending: put submodules directly into the main project.