Multimap support and a test case#25

Open

dmswany wants to merge 2 commits intomikeloomisgg:masterfrom

dmswany:multimap

Commits on Jul 17, 2025

add support for multimap. emplace is fine rather than insert_or_assign since we're presumably unpacking into an empty map.
dmswany
committed

Commits on Jul 18, 2025

test and input data
dmswany
committed