std/flow
vec
⤇ arrange ⤇ chain ⤇ check ⤇ count ⤇ emit ⤇ fill ⤇ filter ⤇ fit ⤇ flock ⤇ generate ⤇ generateIndefinitely ⤇ insert ⤇ merge ⤇ one ⤇ stream ⤇ trigger