The introduced test gives identical results when run on d67a94dc (before the bug was introduced) and with this fix, while after the introduction of the bug but before this fix there are clear differences.
bug was introduced) and with this fix, while after the introduction of the bug
but before this fix there are clear differences.
The other general improvements result in much faster execution time, despite
the fix necessitating additional instantiations of `EvtTwoBodyVertex` objects
that were previously cached.