1.x was rough every point release broke major stuff 2.x was stable all through, but a lot of work to migrate from 1.x 3.x minor changes but a big renaming eff

1.x was rough every point release broke major stuff 2.x was stable all through, but a lot of work to migrate from 1.x 3.x minor changes but a big renaming effort leading to a lot of work in accepting proposed changes in Xcode. Laborious more than difficult 4.x most projects I've tested just compile. On the road to a stable ABI