Indeed, and this is so much an industry standard practice that it was particularly significant when Apple open sourced Swift in Dec 2015, they didn't just do a

Indeed, and this is so much an industry standard practice that it was particularly significant when Apple open sourced Swift in Dec 2015, they didn't just do a tarball dump or promise that development would be in the open going forward, they actually opened up the whole development history right back to the start of the project in 2010: https://github.com/apple/swift/commit/afc81c1855bf711315b8e5de02db138d3d487eeb https://github.com/apple/swift/commit/afc81c1855bf711315b8e5...