# Functions
NewTimeCache defaults to the original ("first seen") cache implementation.
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# Constants
Strategy_FirstSeen expires an entry from the time it was added.
Stategy_LastSeen expires an entry from the last time it was touched by an Add or Has.
# Structs
FirstSeenCache is a time cache that only marks the expiry of a message when first added.
LastSeenCache is a time cache that extends the expiry of a seen message when added or checked for presence with Has..
# Interfaces
TimeCache is a cahe of recently seen messages (by id).
# Type aliases
Stategy is the TimeCache expiration strategy to use.