setGlobalDispatcher should be initGlobalDispatcher...?

[sinkingsugar]

I'm having to consume a module that uses asyncdispatch and I'm scratching my head to make it work properly in my fibers/coroutine heavy setup.
I decided to let each coroutine to have it's own dispatcher but sadly I discovered that it's not possible at all due to setGlobalDispatcher being initGlobalDispatcher
This is the proc...

proc setGlobalDispatcher*(disp: PDispatcher) =
  if not gDisp.isNil:
    assert gDisp.callbacks.len == 0
  gDisp = disp
  initCallSoonProc()

As you can see it supposedly should set the global dispatcher.. but in the process it asserts that it's empty and initializes it basically.
This makes it impossible to have something like withDispatcher mydispatcher for example
where the template would be:

template withDispatcher*(disp: PDispatcher; body: untyped): untyped =
  let currentDispatcher = getGlobalDispatcher()
  setGlobalDispatcher(disp)
  body
  setGlobalDispatcher(currentDispatcher)

To me this makes no sense and both get and init are probably needed.
Currently it's very misleading.