ClientData is an `Option` that can be passed at the `Limit` package-level function.

Every converts a minimum time interval between events to a limit.

ExceedHandler is an `Option` that can be passed at the `Limit` package-level function.

Get returns the current rate limited `Client`.

Limit returns a new rate limiter handler that allows requests up to rate "limit" and permits bursts of at most "burst" tokens.

PurgeEvery is an `Option` that can be passed at the `Limit` package-level function.

SetIdentifier can be called manually from a handler or a middleare to change the identifier per client.

Inf is the infinite rate limit; it allows all events (even if burst is zero).

Option declares a function which can be passed on `Limit` package-level to modify its internal fields.