The new option Clean should have defaulted to false or been highlighted as a breaking change

After upgrading to v3 our deployed app started failing due to being unable to get various javascript files.

It appears that the value for clean is defaulted to true, since on every deployment I only had one set of javascript files. After changing the value explicitly to false I got the expected new set of files for every deployment.

This caused problems for us since previously downloaded SPA apps were looking for older versions of the javascript files. This worked fine in V2.

It would be nice to hightlight this as a breaking change on the relase page rather than just a new feature. Since it can causes issues and is a change in behaviour.