Re: ipairs in Lua 5.3.0-alpha

[Coroutines <coroutines@...>]

On Tue, Aug 5, 2014 at 3:53 AM, Luiz Henrique de Figueiredo
<lhf@tecgraf.puc-rio.br> wrote:

> A central point in Lua semantics is that metamethods correspond to
> events that Lua cannot handle. (Metamethods were originally called
> fallbacks, for this reason.) Addition of two numbers is not such an
> event and it is never performed via a metamethod, even if you define one:
>
>         Lua 5.2.3  Copyright (C) 1994-2013 Lua.org, PUC-Rio
>         > debug.setmetatable(0,{__add=print})
>         > a=1
>         > b=2
>         > =a+b
>         3
>         ... but this works:
>         > debug.setmetatable(0,{__call=print})
>         > a(10,20,30)
>         1       10      20      30

Well yes, I do understand this... I just wish the focus of metamethods
were changed.  It'd be inefficient but interesting to expose the base
mechanics through the primitive types having a metatable -- imo.  It'd
be really cool to disable adding numbers by unreferencing the C code
that handles __add, for example -- this has always been a dream of
mine :\..