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Wim Couwenberg wrote:
table.foreach (or table.foreachi for that matter) can never report a nil value, because nil values are not present in a table.

Lua 5.0.2  Copyright (C) 1994-2004 Tecgraf, PUC-Rio
> function wibble(...)
>> table.foreachi(arg,print)
>> end
> wibble(1,nil,2,nil,3)
1       1
2       nil
3       2
4       nil
5       3

It's related to this, but I can't recreate the exact problem right now - it's deep in the heart of some exceedingly hairy glue code.

The issue was in certain circumstances in 5.1w6, you'd only get the first 3 results.