Re: Freeze avoidance of very large table.

> It is a minor thing, but if there is no other use for this fourth
> "bit-space", it seems a shame to waste it when there is some use for it.  I
> haven't looked at the code around this area to know how hard it would be to
> implement the setting and clearing of the bit.

I think so too, we would be able to use unused fourth status of bits
efficiently.
Should I include these improvement into this patch?
This topic should be discussed on another thread after this feature is
committed, I think.