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A new snapshot of Lua 4.1 (work) is now available at
An updated manual is also available at the same location.

The main change in this version is that Lua now has lexical scoping; upvalues
are gone!

Other changes include C upvalues via pseudo-indices (as suggested by ET),
access to the registry and the table of globals also via pseudo-indices,
better implementation for the "array" part of tables, new "concat" function,
references moved to lauxlib, and more.

Of course, none of these changes are definitive. This is simply a work version
that is being made available so that you can experiment with it, specially to
get a feel of the new lexical scoping.