`table.pack` now routes element writes through `luaSet` so `__newindex`
metamethods are honoured, matching the exact Lua 5.4 semantics. The `n`
field is still written with `rawSet`, also matching Lua.
`table.unpack` now returns an empty `LuaMultiRes` instead of `null` for
an empty range `(i > j)`. Returning `null` would inject a single `nil`
argument at the call site; an empty `LuaMultiRes` correctly contributes
zero values, matching the exact Lua semantics.
The global `unpack` shim (for Lua 5.1 compatibility) has been removed
from `luaBuildStandardEnv`. Users who need the short alias can set it up
in `space-script` with a single line stating `unpack = table.unpack`.
Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>
Matouš Jan Fialka
cc931319d7