Discrepancy with regards to references to reindex.thread.count and index.queue.thread.count

In Content Index Administration, it mentions the following with regards to the reindex.thread.count and index.queue.thread.count properties:

If both reindex.thread.count and index.queue.thread.count are unset, we default to 4 threads.

However, Recognized System Properties mentions this with regards to each:

reindex.thread.count:

• There is no default value.

index.queue.thread.count:

• If you don't set index.queue.thread.count, the number of threads to be used are calculated based on the number of objects that need to be reindexed and the number of processors available (a maximum of 50 threads will be used).
• If you set index.queue.thread.count=2, then two threads will be used to reindex the content (regardless of the number of objects to be reindexed or the number of processors available)
• If you set index.queue.thread.count=200, then ten threads (the maximum allowed) will be used to reindex the content.

Could we verify which of the above statements are true and bring these two documents into agreement?