We can't pass NULL's in middle of ARGV_t, but that gave me an idea...
What we could do is pass pass options and a table and the arguments as another,
and prepend this to the anonymous Lua chunk from C side:
```
opt = select(1, ...)
arg = select(2, ...)
```
Which I think makes it all really nice on the Lua side:
```
%foo(a:b) %{lua
if opt.b
print('do b')
if opt.a
print('a value: '...opt.a)
for i in ipairs(i, arg) do
print(i, arg)
end
--- also these would work
if opt['b']:
print('do b')
print('first arg'..argv[1])
}
```
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