Inconsistent reaping.

[dzink]

On app2.

What I did:
I have three different pull requests A B C, totaling 9.03G out of my 10G limit. All were active and none should be significantly larger than another. One build on C is pinned. I pushed a new commit to A, then a new commit to B.

What I expected to happen:
For reaping purposes, I expected one of the older PR's on B to be reaped, since now that one would be stale.

What actually happened:
The newest build on A that I had just built was reaped, as was the previous build on A. None of the builds on B were reaped, so I ended up with a stale B build I didn't need instead of the fresh build on A I just pushed.