Oh, sorry.

If the actual data was 1.2345678, and you went through some pathway that reduced the precision, like to 1.234, you'd see that kind of behavior.

I suggest that because:

1. The points in the mesh are not very far off from where they should be (they're not in Tokyo), and

2. If it is rounding error, you might think twice about using that method again, and uselessly losing that precision.

FYI - The term is mostly geek programmer talk. For an item of interest (if it is), people used to steal millions from the banks by rounding calculations down to the nearest cent, then collecting the pieces of pennies. So, now most financial institutions have "pieces-of-pennies buckets" in their software. I wrote a lot of that kind of code back in the day.