Clarification on cache delete

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I am looking at the docs (http://www.concrete5.org/documentation/developers/system/caching/) and wondering what this does, as the explanation is somewhat lacking.

Cache::delete('largeRecordsList', false);


Does this delete all cache items for the type largeRecordsList?
Does this delete anything with the id of false and the type largeRecordsList from the cache?

I am caching a number of stats on a per user basis so I have done this.

Cache::set("stat" . $uID, "some_md5_token", $data);


I then want to be able to remove all the stats for a user like so, although this delete operation does not delete the cache for the user. The cache still returns.

Cache::delete("stat" . $uID, false);

yolk