2020-03-21 14:52:42 by Henrik Grubbström (Grubba) <email@example.com>
CHANGES: Added note about binary or with multiset and UNDEFINED.
object. It has now been changed to also use `** (or, rather, pow() is now implemented using predef::`**()).
* Binary or between a multiset and UNDEFINED is now behaves like
binary or between the multiset and the empty multiset.
o Three pass compiler. An extra pass of the compiler has been added. It is used to properly