I took a crack at writing a polygon slice function. The implementation is found here...

https://github.com/erikh2000/hatcher/blob/master/src/turf-slice.js

A nice thing about the algorithm is that is allows slice lines with multiple segments and works with complex polygons containing holes. It is easily extendable to slice through multiple polygons at a time.

There is one caveat to using it, which is understandably a dealbreaker for including it in Turf. The slice line needs to have endpoints that, to say it sloppily, are clear of the polygon it intends to slice. This is because the algorithm depends on extending the slice line into a set of 2 polygonal masks. See the attached image below that explains a case that causes unexpected slice results. I don't see any easy way to fix it other than to ask callers to define slice lines that are outside the convex hull of the polygon they want to slice.

Anyhow, not expecting a resolution to this issue, but I'm posting it here in case anyone wants to use the code as-is or knows some elegant solution to the caveat described.