Operating system: Windows 10 pro
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
When i follow the cup tutorial from MASTERING DRIVERS ON BLENDER 3D in the 2.8 version, using a wireframe cube on target of boolean in difference mode, after move down on Z the difference work like union function.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).