Global Metatables

[RJ Russell <russellsprouts2@...>]

In 5.2, I think it would be great if we could set metatables for ALL
tables and ALL functions, much like you can set it for all strings and
all numbers.
If a single table has a metatable that conflicts with the global
metatable, then the single table's metatable trump it.

--Just an example of what it could do:
debug.setmetatable('tables',{
  __unm=function(op)
    local temp={}
    for k,v in pairs(op)do
      temp[v]=k
    end
    return temp
  end},
  __add=function(a,b)
    local temp={}
    for k,v in pairs(a)do
      temp[k]=v
    end
    for k,v in pairs(b)do
      temp[k]=v
    end
  end)

--Now, dictionaries are very easy to make:
local dictionary=-{'if','then','else'}

--And you can add tables
local newtab={a=4}+{b=6}