- Fork and async are no longer class methods, which simplifies things a lot and
allows for many more trivial instances, much like with MonadHandler. Fork and
async are still available, but instead of unnecessarily being class methods,
they are now provided as follows: You can fork and async a worker (no more
fork/async for handler, because I never actually need that, and not sure
there's ever a need for that in general), and you can do that from any
MonadSite. So, you can fork or async a worker from a Handler, from a Worker,
from a ReaderT on top of them e.g. inside runDB, and so on.
- Following the simplification, new MonadSite instances are provided, so far
just the ones in actual use in the code. ReaderT, ExceptT and lazy RWST. More
can be added easily. Oh, and WidgetFor got an instance too.
In particular, this change means there's no usage of `forkHandler` anymore, at
all. I wonder if it ever makes a difference to `forkWorker` versus
`forkHandler`. Like, does it cause memory leaks or anything. I guess could
check why `forkResource` etc. is good for in `forkHandler` implementation. I
suppose if needed, I could fix possible memory leaks in `forkWorker`.
Worker is enough and seems much simpler. forkHandler does stuff with
forkResourceT and more stuff that I don't exactly understand and which may
involve more resource allocation. I guess forkWorker would generally be the
preferred approach, and there are bugs with delivery leading to sudden
CPU/memory peaks forcing me to kill the process. Maybe not related, just
mentioning it ^_^
