NativeMultiHashMap would be a great addition to this library.

[Arugin]

First of all, thanks for a great library.

So an unordered associative array of key value pairs where the keys don't have to be unique is very useful, especially for game engines. Like NativeParallelMultiHashMap in Unity: https://docs.unity3d.com/Packages/com.unity.collections@2.6/api/Unity.Collections.NativeParallelMultiHashMap-2.html

It would be great, if you add it to this library too.