There has been such a rush from many places to cast this as a "mistake". We just don't know whether this was deliberate or a mistake, anything else is just an opinion. I don't see one explanation being less likely than the other, it's annoying to see one explanation being pushed more than the other.
It's amazing how elusive the obvious can be when your mind's on something else. Given that, I personally assume good faith until there's significant reason to doubt that assumption.
Here's an embarrassingly stupid bug I created (or rather, the one-line patch that fixes it): https://github.com/LnxPrgr3/message_queue/commit/b21944ab63f...
From the wikipedia entry on Occam's Razor.
> In the scientific method, Occam's Razor is not considered an irrefutable principle of logic or a scientific result.