MIT licensed and maintained by Nikita Volkov
This version can be pinned in stack with:stm-containers-1.2@sha256:a887f2e7692b7cf20e0b081e2d66e21076e2bd4b57016ec59c484edfa2d29397,3244

Module documentation for 1.2

Used by 1 package in nightly-2021-09-17(full list with versions):

This library is based on an STM-specialized implementation of Hash Array Mapped Trie. It provides efficient implementations of Map, Set and other data structures, which starting from version 1 perform even better than their counterparts from "unordered-containers", but also scale well on concurrent access patterns.

For details on performance of the library, which are a bit outdated, see this blog post.