Hi all,
  Currently, `guardPageSize` is not stored in core.thread.Fiber. It's only used during construction, so it's currently not necessary to store it. However, for Fiber stack usage tracking, I need it elsewhere too.
Is it agreeable to add an m_guardPageSize member to Fiber to store the information
(i.e. increasing Fiber's size a little). Or is there another way to recover that information later on?

Thanks,
  Johan