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On 2018-03-16 05:56 AM, Andrew Gierth wrote:

"Duane" == Duane Leslie <parakleta@darkreality.org> writes:

  Duane> Hi,

  Duane> A quick and dirty tuple implementation using the new
  Duane> multi-uservalue userdata implementation.

[...]

  >> for i,v in pairs(t) do print(i,v) end

A perfect example of why deprecating __ipairs was the wrong move. It
ought to be possible to make this code work with ipairs(t) as well, but
with no __ipairs metamethod it can't be done.
Uh, the only issue is that ipairs would "respect" nil, but otherwise it does/should work.
But yes, being able to explicitly include nils in ipairs output, i.e. with __ipairs, would be nice.
I don't think the Lua team wants to have both __ipairs and __index respected by ipairs tho... 

Do you know anything in Lua which respects *two* metamethods?

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