Upgrading from 2.3 to 4

I have an app that is currently using 2.3 of the scheduler. It makes fairly extensive use of all the various options. I want to upgrade to v4, should this simply be a drop in upgrade or are there breaking changes? Are these breaking changes documented?

There was no breaking changes, so simple lib replacement must work.
Full list of changes is available here
docs.dhtmlx.com/scheduler/migrat … rsion.html