The kept form of a turn's call tree log, as its store keeps it (another
process, or a page after a reload, reads it so), after the event after
names (list(writer, seq)): those kept so far, then each as it is kept,
until its last. view = "outside": what a caller who sees only the
program's boundary may see.
Usage
turn_events(turn, after = NULL, view = c("kept", "outside"), timeout = NULL)