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On Oct 12, 2011, at 2:36 PM, Alexander Gladysh wrote:

> Most notably table.getn(), string:len(), table.foreach().

string.len is well and kicking, thank you very much :)

http://www.lua.org/manual/5.1/manual.html#pdf-string.len

The length operator is new (in 5.1):

http://www.lua.org/manual/5.1/manual.html#2.5.5 

Perhaps you should write a FAQ :))