Connected service from connect.
KV bucket name, e.g. avenabox.
Keys to read.
Most reads in flight at once. Default KV_READ_CONCURRENCY.
One result per key, in the order of keys: the value (see
getKeyValue, including its "Key value does not exist" text) or the error.
Reads several values from a KV bucket, keeping up to
concurrencyreads in flight.Each read costs one round trip, so reading N keys one after another costs N round trips; this costs about N /
concurrency. Each key is read as by getKeyValue, and one failed read does not stop the others.