OpenBSD 3.8 negative free space (?WTF?)

[John Kintaro Tate <kintarowins_(_at_)_gmail_(_dot_)_com>]

Hrm, I was installing the mono port and I ran into an error. The error
was simple and we all know what it means.

Trying 62.243.72.50...
Unimplemented command.
 61% |******************************                    |  8922 KB    04:55 ETA
/: write failed, file system is full

So I did the next thing that comes naturally, I aborted and did a df -h...

# df -h
Filesystem                    Size    Used   Avail Capacity  Mounted on
/dev/wd0a                     787M    778M  -30.6M   104%    /

WTF is going on here? -30.6M sounds kinda weird.

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