Ted Mielczarek on Nostr: you unlocked multiball! But seriously: getting per-character interleaving like that ...

you unlocked multiball! But seriously: getting per-character interleaving like that requires going out of the way to do weird things. glibc line-buffers output by default. Even on Windows—which has the worst default behavior—output is buffered in chunks of 1KB or so. Is something in there really writing a byte at a time to stdout without buffering???