Table output improvement

[toxamin]

When given the following script:

local tbl = {
    {},
    [100000] = {}
}

Metaworm's luadec either:

1. generates a file with over 100 thousand lines (luajit):

local r0_0 = {
  {},
  nil,
  nil,
  nil,
  nil,
  nil,
  nil,
  nil
...

2. fails to generate the second value at all, like so:

local r0_0 = {
  {}
}