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> When ?!$@ are possible: why doesn't use Lua one of this chars for
> special identifiers instead of <underscore><uppercase>? I would like to
> use my own namespace*s* and this isn't easy because _... is the only
> possibility to start with a non-letter?

According  to the documentation and source code, you can't use the 
characters ?!$@ in identifiers.

There are probably sereval ways to implement different namespaces in
Lua. I think that the most natural way is to create a table and put all
protected symbols in it. Something like:

local namespace = {}
namespace.x = 2