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This topic comes up regularly, so you may want to review previous
posts on the topic: (e.g. search the GMane Loom for "global local
default" sorted by date)

2008/4/29 Anticept <>:
> Good Day everyone,
>   I would like to ask why Lua scope is global default? I have tried combing
> the message boards for a reason as to why this is set to work this way, but
> to no avail. I do not mean any insult to anyone, but isn't this a bad
> practice, especially for an embeddable language? With many games using this
> language to allow customization and modification to the game itself, I find
> this becomes prone to errors, particularly for new programmers.
>   For example, the game "Garry's Mod" uses Lua to create the tools and
> functions of the game to interact with the environment. However, often many
> new and experienced programmers alike sometimes overlook scope during the
> course of their programming, and this creates subtle conflicts that
> sometimes break down the game experience. Also, very often, as many
> modifications are installed to the game, these subtle conflicts can cause
> catastrophe, and make bug squashing very very difficult, as by themselves,
> these modifications work flawlessly.
>   Is there a possibility of Lua moving away from this? Or perhaps, allowing
> the embedding programmer to change the default scope?
>   I thank you for your time! :-)
>   -Corey