v$lock - Blocker

Hello.

I find this odd on v$lock.

My version is 10.2.0.3.0.
As per the 10.2.0.3 documentation, v$lock.block has A value of either 0 or
1, depending on whether or not the lock in question is the blocker.

But, I find

 select distinct block from v$lock ;

 BLOCK
------
     1
     2
     0

Any ideas?

Thanks,
Shiva

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