OptionalsizeMaximum number of remembered inbound keys. When exceeded, the
least-recently-seen key is forgotten. Positive integer; default
DEFAULT_DEDUPE_SIZE (1000).
OptionalttlOptional time-to-live per remembered key, in ms or as a duration string
('30s', '10m', '1h'). Measured from when the key was first accepted.
0/omitted = keys live until evicted by size.
User-facing options for
BotConfig.dedupe.