racket-matrix-2012/TODO

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## os.rkt and friends
- move from quasiquoted to prefab structs
- define a prefab struct for every evt? that we want to use
- define lowest-level drivers for each prefab struct
It feels like those lowest-level drivers are listening for *demand*
i.e. they're listening for presence and are then acting to supply such
demand. Think about the relationships between presence (both positive
and negative), and interfacing to ad-hoc sources and sinks.
### Old, possibly-still-relevant TODOs from os.rkt
- is timeout really primitive? If so, isn't presence primitive?
- what about metatimeout?
- enforce user-mode restrictions
### Abstract out UDP socket creation
### Things to consider doing to os-big-bang.rkt
- add contracts on structs used as message types e.g. to catch such
as #(192 203 230 10) being used instead of (udp-address
"192.203.230.10" 53).
- some kind of join-ish construct to make e.g. cname-expansion
prettier
- have a "terminate" kind of transition for unspawning the
transitioning process