You're right, it's dumb, and I take full responsibility for this one, and why I put them that way around I'll never know. You can blame one, or all of:
1. Gross stupidity
2. I have no idea what I was doing
3. The technical editor is blind
4. Too much malt whisky
These sort of things are interesting in hindsight; it's such a simple thing, it's always surprising when it slips through. And there's no need to apologise - you should be critical of things like this. Errors do creep into manuscripts, but this sort of thing brings more confusion that an error because it's less obvious as to whether there really is a problem or not.
So sorry for confusing you, and as Chris says, we'll try and get this corrected in reprints and the C# version