ZPE bubbling

Another prominent feature brought to ZPE this year is bubbling. ZPE will introduce bubbling with version 1.12.7. It is used for interrupts such as exit requests, errors, and breakpoints. These are called bubbles since they are up to the program's top. So, for example, an exit request no longer exits ZPE; it handles a bubble instead to decide what to do with it (and, of course, that might be to exit, or it might be to close the active thread).

Bubbling is a huge feature that changes many of the underlying implementations of ZPE.