• Previously, -cleanDisk would only remove cache files that were older
    than the configured expiration date.  This allowed the disk cache to
    grow significantly if a large number of resources were cached over a
    short period of time.
    
    This change adds a second (optional) size-based cleaning pass that
    removes files from the disk cache until its overall size falls below
    half of the configured maximum size.  Older files are deleted first.
    
    The size-based pass is disabled by default (maxCacheSize == 0).
    by Jon Parise
     
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