kv-list: completes test coverage default tip

add tests for creating iterators with NULL lists or maps

the elem_count member of an iterator was not updated after removing an element flagged by cxIteratorFlagRemoval() - fixes #728

kv-list: implement mutating iterator support

add changelog entry

implement non-mutating iterator

allow setting the key again on the same node

disallow setting a key that already exists

consider the edge case that either list or map operation fails when adding an element

increase test coverage for kv-list

(0) -1000 -300 -100 -10 tip

mercurial