There might be a typo in the inheritRefs example from the documentation https://zio.dev/docs/datatypes/fiber/fiberref#inheritrefs:

val withoutJoin =
  for {
    fiberRef <- FiberRef.make[Int](0)
    fiber    <- fiberRef.set(10)
    v        <- fiberRef.get
  } yield assert(v == 10)

in this example the fiber is not forked and the type of fiber is Unit, also inheritRefs is not called.

While the value of v will still be 10 and the example will pass, it might not demonstrate how to call inheritRefs manually.

Tried to fix the example by forking a fiber and using inheritRefs (as explained in the documentation I read before this example), tested the updated example locally and it passes as expected.