Acquires the given number of permits from this {@code RateLimiter}, blocking until the request can be granted. Tells the amount of time slept, if any.
This method is equivalent to {@code acquire(1)}.
@return time spent sleeping to enforce rate, in seconds; 0.0 if not rate-limited
@since 16.0 (present in 13.0 with {@code void} return type})
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