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ea7d8ec147
Switch Node.Parent, Node.Index, and Node.OptionalIndex to be backed by u8 rather than u16. This works fine since we use 200 as the preallocated node buffer. This has the nice property that scanning the entire parents array for allocated nodes fits in 4 cache lines, even if we bumped the 200 up to 254 (leaving room for the two special states). The thread that reads progress updates from the pipe now handles short reads by ignoring messages that are sent in multiple reads. When checking the terminal size, if there is a failure, fall back to a conservative guess of 80x25 rather than panicking. A debug message is also emitted which would be displayed only in a debug build.