Optionalbootedan interpreter is up on the object
Optionalbootedthis particular fill is what paid for the boot; near the opposite of booted on a warm fill
OptionalclosedOptionaldrainedOptionalerrorOptionalfilledOptionalfillsOptionalremaining
One reply from the object, per message pumped.
Every field but
okis conditional:filledis the path a fill produced or null when the queue was empty,bootedrides on fill replies only -- which is what makes "every fill after the first shared one interpreter" observable -- and the trailing drained signal carries neither.