I got bitten by a similar pluralization issue when I tried to use Rails. I spent a good amount of time messing around to try to figure out what I was doing wrong that was preventing Rails from pluralizing ETA like it did with my other classes. Turns out that to Ruby/Rails the plural of ETA is ETA... I haven't touched Rails since then.

I don't like over-explicit code like Go forces on you, but if I was forced to choose between over-explicit and over-implicit, I wouldn't have to think twice about going for the explicit language.