Before upgrading, it is advised to read the changelog. When upgrading several versions, please read all notes applying to the upgrade.
4.0.3 to 4.0.4
One setting has been added to limit the risk of overflowing the stack:
max-recursion-depthdefaults to 40 and was unlimited before
4.0.0 to 4.0.1
Two settings have changed defaults, these new defaults decrease CPU usage: