Phobos - breaking existing code

[via Digitalmars-d]

You probably have realized that the obvious solution to breakage 
is:

1. To have two branches: stable and experimental

2. Backport serious bugfixes to stable, but not "bug is a 
feature" bugs.

3. Provide an upgrade tool when a new stable branch is created 
(meaning: a new stable branch is not created until the 
source-code upgrade tool is ready)

4. Create a planned release scheduled for stable branch (say 
18-24 months)