2020-02-22 16:23:48 by Henrik Grubbström (Grubba) <email@example.com>
CHANGES: Added note about m_delete() and m_clear().
gc() called with a weak mapping as argument now removes weak references that are only held by that mapping.
m_clear() now supports operation on multisets and objects.
m_delete() now supports operation on multisets.
o ADT.Heap - An indirection object ADT.Heap.Element has been added to make it