[aeturnum]

I've done a lot of work in Lua and haven't really found it to be an issue. As long as you stick to doing things the "lua way" (i.e. pairs / ipairs), the specific indexes matter very little. Every once in a while I'll have an, "oh yah," moment where I use the wrong index and something doesn't work, but I don't see how it's a deal breaker for anyone.

There are many features of Lua that have caused me more problems (the somewhat inconsistent string conversion, for instance).