open column values in thread table

[cfish]

There are 3 different values in the "open" column of the "thread" table.

A value of "1" means that the thread is open.

A value of "0" means that the thread is closed.

But what does a value of "10" mean? It looks as though these threads are open and not hidden.

[Tronix]

I was having troubles with this as well, but I figured it out:
1 = open
0 = closed
10 = merged