[mikemintz]

I don't think there are actually any breaking changes. The release notes say "includeInitial" is breaking, but I think all of your existing application code will continue to run the same if you upgrade RethinkDB. It's just that new code using includeInitial will fail on old versions of RethinkDB.

[bryanlarsen]

In 2.1 some changes commands included an initial value. Now none do unless you add the flag. If you depended on that behavior, your app could break.

[mikemintz]

Thanks, I stand corrected! I always ignored initial values so I forgot about that case.