The amount of data to cache for the given stream.
Possible formats:
 - A number in seconds.
 - A percentage string (XX%) for a proportion of the content duration.
Optional bandwidthUpper bandwidth limit of the quality to cache.
 - This will take the quality with the highest bandwidth that is lower than the specified bandwidth.
 - It should be a value between zero and infinity.
Infinity
Optional expirationThe expiration date of the cached data.
 - Must be a date in the future.
 - Data might be removed by the browser if it runs out of disk space.
30 minutes after starting the caching task.
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Describes the configuration of a caching task.