bdwgc’s maintainer ivmai merged in
The functionality proposed in https://github.com/ivmai/bdwgc/pull/277 that was an outcome of the efforts for the in-progress effort of supporting MT in Crystal.
It happened that other user wanted to use the same feature at the same time 0.28.0 was released so there is definitely a chance this contribution will find its ways to support green threads (fibers) for other bdwgc users also.