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On 07/08/16 05:55 AM, Dirk Laurie wrote:
2016-08-07 6:58 GMT+02:00 Tim Hill <>:

table.len = function(t) return #t end
But = function(t)
    local mt = getmetatable(t)
    local len = #setmetatable(t)
    return len

is less trivial, and sufficiently cumbersome to jusitfy implementation
at a lower level.

How about

table.len = function(t)
assert(type(t) == "table", "bad argument #1 to 'len' (table expected, got "..type(t)..")")
  return #t

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