[J0-onas]

Im guessing making somwhat radical decision that are not backwards compatible.

However, Python 2/3 is a better example for breaking backwards compatibility.

[DennisP]

I just started learning Swift, and I keep running into stackoverflow answers saying "Here's how it worked in 1.0. In 1.2 you have to do this instead. But in 2.0 you do it this other way."