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* **`pw` is tiny:** it is a little over 2000 lines of C in a single source
file, compiling to an executable of around 32 kilobytes.
+ (Except on MacOS, where an additional file called `macpoll.c` is
+ compiled and linked in, because MacOS's `poll` function does not work with
+ devices such as TTYs, only pipes and sockets.)
* **`pw` requires a very low amount of RAM:** Given inputs with typical line
lengths, and 24 line snapshots, `pw` it needs less than 64 kilobytes of RAM